diff --git a/BeeKit/ImageDownloadService.swift b/BeeKit/ImageDownloadService.swift
new file mode 100644
index 000000000..8544f933a
--- /dev/null
+++ b/BeeKit/ImageDownloadService.swift
@@ -0,0 +1,10 @@
+// Part of BeeSwift. Copyright Beeminder
+
+import AlamofireImage
+
+final public class ImageDownloadService {
+  static public let shared = ImageDownloadService()
+  public let downloader: ImageDownloader
+
+  private init() { downloader = ImageDownloader.default }
+}
diff --git a/BeeKit/Managers/CurrentUserManager.swift b/BeeKit/Managers/CurrentUserManager.swift
index da0df4487..402702f36 100644
--- a/BeeKit/Managers/CurrentUserManager.swift
+++ b/BeeKit/Managers/CurrentUserManager.swift
@@ -36,13 +36,13 @@ import SwiftyJSON
 
   internal static let keychainPrefix = "CurrentUserManager_"
 
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
 
   fileprivate static var allKeys: [String] {
     [accessTokenKey, usernameKey, deadbeatKey, defaultLeadtimeKey, defaultAlertstartKey, defaultDeadlineKey, beemTZKey]
   }
 
-  init(requestManager: RequestManager, container: BeeminderPersistentContainer) {
+  init(requestManager: RequestManaging, container: BeeminderPersistentContainer) {
     self.requestManager = requestManager
     self.modelContainer = container
     let context = container.newBackgroundContext()
diff --git a/BeeKit/Managers/DataPointManager.swift b/BeeKit/Managers/DataPointManager.swift
index 1480c4fb1..dd0492379 100644
--- a/BeeKit/Managers/DataPointManager.swift
+++ b/BeeKit/Managers/DataPointManager.swift
@@ -12,9 +12,9 @@ import SwiftyJSON
   // prevents effectively no-op updates due to float rounding
   private let datapointValueEpsilon = 0.00000001
 
-  let requestManager: RequestManager
+  let requestManager: RequestManaging
 
-  init(requestManager: RequestManager, container: BeeminderPersistentContainer) {
+  init(requestManager: RequestManaging, container: BeeminderPersistentContainer) {
     self.requestManager = requestManager
     self.modelContainer = container
     let context = container.newBackgroundContext()
diff --git a/BeeKit/Managers/GoalManager.swift b/BeeKit/Managers/GoalManager.swift
index 6d93a1fc4..1a7d0e007 100644
--- a/BeeKit/Managers/GoalManager.swift
+++ b/BeeKit/Managers/GoalManager.swift
@@ -16,12 +16,12 @@ import SwiftyJSON
 @NSModelActor(disableGenerateInit: true) public actor GoalManager {
   private let logger = Logger(subsystem: "com.beeminder.beeminder", category: "GoalManager")
 
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private nonisolated let currentUserManager: CurrentUserManager
 
   private var queuedGoalsBackgroundTaskRunning: Bool = false
 
-  init(requestManager: RequestManager, currentUserManager: CurrentUserManager, container: BeeminderPersistentContainer)
+  init(requestManager: RequestManaging, currentUserManager: CurrentUserManager, container: BeeminderPersistentContainer)
   {
     modelContainer = container
     let context = container.newBackgroundContext()
diff --git a/BeeKit/Managers/RequestManager.swift b/BeeKit/Managers/RequestManager.swift
index 8113b6114..094de030c 100644
--- a/BeeKit/Managers/RequestManager.swift
+++ b/BeeKit/Managers/RequestManager.swift
@@ -11,36 +11,12 @@ import Foundation
 import OSLog
 import SwiftyJSON
 
-public enum ServerError: LocalizedError {
-  case notFound
-  case unauthorized
-  case forbidden
-  case serverError(Int)
-  case custom(String, requestError: Error?)
-  public var errorDescription: String? {
-    switch self {
-    case .notFound: return "Not found"
-    case .unauthorized: return "Unauthorized"
-    case .forbidden: return "Permission denied"
-    case .serverError(let code): return "Server error (\(code)). Please try again later"
-    case .custom(let message, _): return message
-    }
-  }
-  var requestError: Error? {
-    switch self {
-    case .custom(_, let error): return error
-    default: return nil
-    }
-  }
-}
-
-public class RequestManager {
+public actor RequestManager {
   public let baseURLString = Config().baseURLString
   private let logger = Logger(subsystem: "com.beeminder.beeminder", category: "RequestManager")
   func rawRequest(url: String, method: HTTPMethod, parameters: [String: Any]? = nil, headers: HTTPHeaders) async throws
     -> Any?
   {
-
     var urlWithSubstitutions = url
     if url.contains("{username}") {
       guard let username = await ServiceLocator.currentUserManager.username else {
@@ -51,8 +27,7 @@ public class RequestManager {
       }
       urlWithSubstitutions = urlWithSubstitutions.replacingOccurrences(of: "{username}", with: username)
     }
-
-    let encoding: ParameterEncoding = if method == .get { URLEncoding.default } else { JSONEncoding.default }  // TODO
+    let encoding: ParameterEncoding = method == .get ? URLEncoding.default : JSONEncoding.default
     let response = await AF.request(
       "\(baseURLString)/\(urlWithSubstitutions)",
       method: method,
@@ -60,27 +35,21 @@ public class RequestManager {
       encoding: encoding,
       headers: HTTPHeaders.default + headers
     ).validate().serializingData(emptyRequestMethods: [HTTPMethod.post]).response
-
     switch response.result {
     case .success(let data):
-      let asJSON = try? JSONSerialization.jsonObject(with: data)
-      return asJSON
-
+      return try await Task.detached(priority: .low) { try JSONSerialization.jsonObject(with: data) }.value
     case .failure(let error):
       logger.error("Error issuing request \(url): \(error, privacy: .public)")
-
       // Log out the user on an unauthorized response
       if case .responseValidationFailed(let reason) = error {
         if case .unacceptableStatusCode(let code) = reason {
           if code == 401 { try? await ServiceLocator.currentUserManager.signOut() }
         }
       }
-
       // If we receive an error message from the server use it as our user-visible error
       if let data = response.data, let errorMessage = try JSON(data: data)["error_message"].string {
         throw ServerError.custom(errorMessage, requestError: error)
       }
-
       // Handle common HTTP errors with specific error types
       if case .responseValidationFailed(let reason) = error {
         if case .unacceptableStatusCode(let code) = reason {
@@ -93,10 +62,16 @@ public class RequestManager {
           }
         }
       }
-
       throw error
     }
   }
+  func authenticationHeaders() -> HTTPHeaders {
+    guard let accessToken = ServiceLocator.currentUserManager.accessToken else { return HTTPHeaders() }
+    return HTTPHeaders([HTTPHeader(name: "Authorization", value: "Bearer " + accessToken)])
+  }
+}
+
+extension RequestManager: RequestManaging {
   public func get(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
     return try await rawRequest(url: url, method: .get, parameters: parameters, headers: authenticationHeaders())
   }
@@ -109,11 +84,6 @@ public class RequestManager {
   public func delete(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
     return try await rawRequest(url: url, method: .delete, parameters: parameters, headers: authenticationHeaders())
   }
-  func authenticationHeaders() -> HTTPHeaders {
-    guard let accessToken = ServiceLocator.currentUserManager.accessToken else { return HTTPHeaders() }
-    return HTTPHeaders([HTTPHeader(name: "Authorization", value: "Bearer " + accessToken)])
-  }
-
   public func addDatapoint(urtext: String, slug: String, requestId: String? = nil) async throws -> Any? {
     let params = ["urtext": urtext, "requestid": requestId].compactMapValues { $0 }
     return try await post(url: "api/v1/users/{username}/goals/\(slug)/datapoints.json", parameters: params)
@@ -128,3 +98,33 @@ extension HTTPHeaders {
     return HTTPHeaders(allHeaders)
   }
 }
+
+extension RequestManager: SignedRequestManaging {
+  public func signedGET(url: String, parameters: [String: Any]?) async throws -> Any? {
+    let params = signedParameters(parameters)
+    return try await rawRequest(url: url, method: .get, parameters: params, headers: authenticationHeaders())
+  }
+  public func signedPOST(url: String, parameters: [String: Any]?) async throws -> Any? {
+    let params = signedParameters(parameters)
+    return try await rawRequest(url: url, method: .post, parameters: params, headers: authenticationHeaders())
+  }
+  fileprivate func signedParameters(_ params: [String: Any]?) -> [String: Any]? {
+    if params == nil { return params }
+    var signed = params
+    var base = ""
+    var keys = Array(params!.keys)
+    keys.sort(by: { $0 < $1 })
+    for key in keys {
+      let value: AnyObject? = params![key] as AnyObject?
+      if !(value is String) { return params! }
+      let allowedCharacterSet = (CharacterSet(charactersIn: "@/").inverted)
+      let escapedKey = key.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet)
+      let escapedValue = (params![key] as AnyObject).addingPercentEncoding(withAllowedCharacters: allowedCharacterSet)
+      if base.count > 0 { base += "&" }
+      base += "\(escapedKey!)=\(escapedValue!)"
+    }
+    let token = base.hmac(algorithm: HMACAlgorithm.SHA1, key: Config().requestSigningKey)
+    signed?["beemios_token"] = token
+    return signed! as [String: Any]
+  }
+}
diff --git a/BeeKit/Managers/RequestManaging.swift b/BeeKit/Managers/RequestManaging.swift
new file mode 100644
index 000000000..abefc8519
--- /dev/null
+++ b/BeeKit/Managers/RequestManaging.swift
@@ -0,0 +1,27 @@
+// Part of BeeSwift. Copyright Beeminder
+
+public protocol RequestManaging {
+  func get(url: String, parameters: [String: Any]?) async throws -> Any?
+  func put(url: String, parameters: [String: Any]?) async throws -> Any?
+  func post(url: String, parameters: [String: Any]?) async throws -> Any?
+  func delete(url: String, parameters: [String: Any]?) async throws -> Any?
+  func addDatapoint(urtext: String, slug: String, requestId: String?) async throws -> Any?
+}
+
+extension RequestManaging {
+  public func get(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+    try await get(url: url, parameters: parameters)
+  }
+  public func put(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+    try await put(url: url, parameters: parameters)
+  }
+  public func post(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+    try await post(url: url, parameters: parameters)
+  }
+  public func delete(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+    try await delete(url: url, parameters: parameters)
+  }
+  public func addDatapoint(urtext: String, slug: String, requestId: String? = nil) async throws -> Any? {
+    try await addDatapoint(urtext: urtext, slug: slug, requestId: requestId)
+  }
+}
diff --git a/BeeKit/Managers/ServerError.swift b/BeeKit/Managers/ServerError.swift
new file mode 100644
index 000000000..e22390e7d
--- /dev/null
+++ b/BeeKit/Managers/ServerError.swift
@@ -0,0 +1,26 @@
+// Part of BeeSwift. Copyright Beeminder
+
+import Foundation
+
+public enum ServerError: LocalizedError {
+  case notFound
+  case unauthorized
+  case forbidden
+  case serverError(Int)
+  case custom(String, requestError: Error?)
+  public var errorDescription: String? {
+    switch self {
+    case .notFound: return "Not found"
+    case .unauthorized: return "Unauthorized"
+    case .forbidden: return "Permission denied"
+    case .serverError(let code): return "Server error (\(code)). Please try again later"
+    case .custom(let message, _): return message
+    }
+  }
+  var requestError: Error? {
+    switch self {
+    case .custom(_, let error): return error
+    default: return nil
+    }
+  }
+}
diff --git a/BeeKit/Managers/SignedRequestManager.swift b/BeeKit/Managers/SignedRequestManager.swift
deleted file mode 100644
index 3cbac6ce5..000000000
--- a/BeeKit/Managers/SignedRequestManager.swift
+++ /dev/null
@@ -1,54 +0,0 @@
-//
-//  SignedRequestManager.swift
-//  BeeSwift
-//
-//  Created by Andy Brett on 11/30/17.
-//  Copyright 2017 APB. All rights reserved.
-//
-
-import Alamofire
-import Foundation
-
-public class SignedRequestManager {
-  private let requestManager: RequestManager
-
-  init(requestManager: RequestManager) { self.requestManager = requestManager }
-
-  public func signedGET(url: String, parameters: [String: Any]?) async throws -> Any? {
-    let params = signedParameters(parameters)
-    return try await requestManager.rawRequest(
-      url: url,
-      method: .get,
-      parameters: params,
-      headers: requestManager.authenticationHeaders()
-    )
-  }
-  public func signedPOST(url: String, parameters: [String: Any]?) async throws -> Any? {
-    let params = signedParameters(parameters)
-    return try await requestManager.rawRequest(
-      url: url,
-      method: .post,
-      parameters: params,
-      headers: requestManager.authenticationHeaders()
-    )
-  }
-  fileprivate func signedParameters(_ params: [String: Any]?) -> [String: Any]? {
-    if params == nil { return params }
-    var signed = params
-    var base = ""
-    var keys = Array(params!.keys)
-    keys.sort(by: { $0 < $1 })
-    for key in keys {
-      let value: AnyObject? = params![key] as AnyObject?
-      if !(value is String) { return params! }
-      let allowedCharacterSet = (CharacterSet(charactersIn: "@/").inverted)
-      let escapedKey = key.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet)
-      let escapedValue = (params![key] as AnyObject).addingPercentEncoding(withAllowedCharacters: allowedCharacterSet)
-      if base.count > 0 { base += "&" }
-      base += "\(escapedKey!)=\(escapedValue!)"
-    }
-    let token = base.hmac(algorithm: HMACAlgorithm.SHA1, key: Config().requestSigningKey)
-    signed?["beemios_token"] = token
-    return signed! as [String: Any]
-  }
-}
diff --git a/BeeKit/Managers/SignedRequestManaging.swift b/BeeKit/Managers/SignedRequestManaging.swift
new file mode 100644
index 000000000..be1ab1519
--- /dev/null
+++ b/BeeKit/Managers/SignedRequestManaging.swift
@@ -0,0 +1,15 @@
+// Part of BeeSwift. Copyright Beeminder
+
+public protocol SignedRequestManaging {
+  func signedGET(url: String, parameters: [String: Any]?) async throws -> Any?
+  func signedPOST(url: String, parameters: [String: Any]?) async throws -> Any?
+}
+
+extension SignedRequestManaging {
+  public func signedGET(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+    try await signedGET(url: url, parameters: parameters)
+  }
+  public func signedPOST(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+    try await signedPOST(url: url, parameters: parameters)
+  }
+}
diff --git a/BeeKit/Managers/VersionManager.swift b/BeeKit/Managers/VersionManager.swift
index 9a48371f8..0bb59cce0 100644
--- a/BeeKit/Managers/VersionManager.swift
+++ b/BeeKit/Managers/VersionManager.swift
@@ -23,9 +23,9 @@ private let ageOfReleaseToWarn: TimeInterval = 10.0 * dayInSeconds
 public class VersionManager {
   private var minRequiredVersion: String = "1.0"
   private var updateState = UpdateState.UpToDate
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
 
-  init(requestManager: RequestManager) { self.requestManager = requestManager }
+  init(requestManager: RequestManaging) { self.requestManager = requestManager }
 
   public func lastChckedUpdateState() -> UpdateState { return updateState }
 
diff --git a/BeeKit/ServiceLocator.swift b/BeeKit/ServiceLocator.swift
index c1c6dcdf3..9da69cbab 100644
--- a/BeeKit/ServiceLocator.swift
+++ b/BeeKit/ServiceLocator.swift
@@ -6,16 +6,20 @@
 //  Copyright 2023 APB. All rights reserved.
 //
 
+import AlamofireImage
 import Foundation
 import OSLog
 
 public class ServiceLocator {
   private static let logger = Logger(subsystem: "com.beeminder.beeminder", category: "ServiceLocator")
 
+  private static let sharedRequestManager = RequestManager()
+
+  public static let requestManager: RequestManaging = sharedRequestManager
+  public static let signedRequestManager: SignedRequestManaging = sharedRequestManager
+
   public static let persistentContainer = BeeminderPersistentContainer.create()
 
-  public static let requestManager = RequestManager()
-  public static let signedRequestManager = SignedRequestManager(requestManager: requestManager)
   public static let currentUserManager = CurrentUserManager(
     requestManager: requestManager,
     container: persistentContainer
@@ -33,4 +37,6 @@ public class ServiceLocator {
     goalManager: goalManager,
     container: persistentContainer
   )
+
+  public static let imageDownloader = ImageDownloadService.shared.downloader
 }
diff --git a/BeeKitTests/DataPointManagerTests.swift b/BeeKitTests/DataPointManagerTests.swift
index 06bf76a88..b03b0474e 100644
--- a/BeeKitTests/DataPointManagerTests.swift
+++ b/BeeKitTests/DataPointManagerTests.swift
@@ -17,7 +17,8 @@ class MockHealthKitDataPoint: BeeDataPoint {
   }
 }
 
-class MockRequestManagerForDataPoint: RequestManager {
+class MockRequestManagerForDataPoint: RequestManaging {
+  func post(url: String, parameters: [String: Any]?) async throws -> Any? { nil }
   private let queue = DispatchQueue(label: "com.beeminder.MockRequestManagerForDataPoint")
   private var _responses: [String: Any] = [:]
   private var _putCalls: [(url: String, parameters: [String: Any])] = []
@@ -32,7 +33,7 @@ class MockRequestManagerForDataPoint: RequestManager {
   var deleteCalls: [String] { queue.sync { _deleteCalls } }
   var addDatapointCalls: [(urtext: String, slug: String, requestId: String)] { queue.sync { _addDatapointCalls } }
 
-  override func get(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+  func get(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
     let response = queue.sync { () -> Any? in
       if let response = _responses[url] {
         _responses.removeValue(forKey: url)
@@ -42,15 +43,15 @@ class MockRequestManagerForDataPoint: RequestManager {
     }
     return response ?? []
   }
-  override func put(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+  func put(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
     queue.sync { _putCalls.append((url: url, parameters: parameters ?? [:])) }
     return [:]
   }
-  override func delete(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+  func delete(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
     queue.sync { _deleteCalls.append(url) }
     return [:]
   }
-  override func addDatapoint(urtext: String, slug: String, requestId: String? = nil) async throws -> Any? {
+  func addDatapoint(urtext: String, slug: String, requestId: String? = nil) async throws -> Any? {
     queue.sync { _addDatapointCalls.append((urtext: urtext, slug: slug, requestId: requestId ?? "")) }
     return [:]
   }
diff --git a/BeeKitTests/GoalManagerTests.swift b/BeeKitTests/GoalManagerTests.swift
index 361d19951..beaff3e69 100644
--- a/BeeKitTests/GoalManagerTests.swift
+++ b/BeeKitTests/GoalManagerTests.swift
@@ -5,9 +5,13 @@ import XCTest
 
 @testable import BeeKit
 
-class MockRequestManager: RequestManager {
+class MockRequestManager: RequestManaging {
+  func addDatapoint(urtext: String, slug: String, requestId: String?) async throws -> Any? { nil }
+  func delete(url: String, parameters: [String: Any]?) async throws -> Any? { nil }
+  func post(url: String, parameters: [String: Any]?) async throws -> Any? { nil }
+  func put(url: String, parameters: [String: Any]?) async throws -> Any? { nil }
   var responses: [String: Any] = [:]
-  override func get(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
+  func get(url: String, parameters: [String: Any]? = nil) async throws -> Any? {
     if let response = responses[url] { return response }
     XCTFail("Unexpected URL requested: \(url)")
     return nil
diff --git a/BeeSwift.xcodeproj/project.pbxproj b/BeeSwift.xcodeproj/project.pbxproj
index 0a38105de..68e8f822d 100644
--- a/BeeSwift.xcodeproj/project.pbxproj
+++ b/BeeSwift.xcodeproj/project.pbxproj
@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		9BA7F9052F40723300CF84BE /* AlamofireImage in Frameworks */ = {isa = PBXBuildFile; productRef = 9BA7F9042F40723300CF84BE /* AlamofireImage */; };
 		A12BA94E1AFF202200AFEF32 /* SystemConfiguration.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = A12BA94D1AFF202200AFEF32 /* SystemConfiguration.framework */; };
 		A158DDB61E46EEA10031BD4F /* HealthKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = A158DDB51E46EEA10031BD4F /* HealthKit.framework */; };
 		A17E930C1B09032F0098FCA0 /* QuartzCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = A17E930B1B09032F0098FCA0 /* QuartzCore.framework */; };
@@ -208,6 +209,7 @@
 				E458C8292AD12057000DCA5C /* OrderedCollections in Frameworks */,
 				E4015DA22D1E7B2D00F58D94 /* CoreDataEvolution in Frameworks */,
 				E458C8222AD11D40000DCA5C /* Alamofire in Frameworks */,
+				9BA7F9052F40723300CF84BE /* AlamofireImage in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -369,6 +371,7 @@
 				E458C8232AD11D7F000DCA5C /* KeychainSwift */,
 				E458C8282AD12057000DCA5C /* OrderedCollections */,
 				E4015DA12D1E7B2D00F58D94 /* CoreDataEvolution */,
+				9BA7F9042F40723300CF84BE /* AlamofireImage */,
 			);
 			productName = BeeKit;
 			productReference = E57BE6E02655EBD900BA540B /* BeeKit.framework */;
@@ -1155,6 +1158,11 @@
 /* End XCRemoteSwiftPackageReference section */
 
 /* Begin XCSwiftPackageProductDependency section */
+		9BA7F9042F40723300CF84BE /* AlamofireImage */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = E462BA3729AC450000E80EF0 /* XCRemoteSwiftPackageReference "AlamofireImage" */;
+			productName = AlamofireImage;
+		};
 		E4015DA12D1E7B2D00F58D94 /* CoreDataEvolution */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = E4015DA02D1E7B2D00F58D94 /* XCRemoteSwiftPackageReference "CoreDataEvolution" */;
diff --git a/BeeSwift/Components/GoalImageView.swift b/BeeSwift/Components/GoalImageView.swift
index 30106b4a5..3d06adbc9 100644
--- a/BeeSwift/Components/GoalImageView.swift
+++ b/BeeSwift/Components/GoalImageView.swift
@@ -7,7 +7,7 @@ import OSLog
 /// Shows the current graph for a goal
 /// Handles placeholders for loading and queued states, and automatically updates when the goal changes
 class GoalImageView: UIView {
-  private static let downloader = ImageDownloader(imageCache: AutoPurgingImageCache())
+  private static let downloader = ServiceLocator.imageDownloader
   private let logger = Logger(subsystem: "com.beeminder.beeminder", category: "GoalImageView")
 
   private let imageView = UIImageView()
diff --git a/BeeSwift/Gallery/GalleryViewController.swift b/BeeSwift/Gallery/GalleryViewController.swift
index 030a318b9..5ff1f0b5e 100644
--- a/BeeSwift/Gallery/GalleryViewController.swift
+++ b/BeeSwift/Gallery/GalleryViewController.swift
@@ -6,6 +6,7 @@
 //  Copyright 2015 APB. All rights reserved.
 //
 
+import AlamofireImage
 import BeeKit
 import CoreData
 import HealthKit
@@ -29,7 +30,7 @@ class GalleryViewController: UIViewController {
   private let versionManager: VersionManager
   private let goalManager: GoalManager
   private let healthStoreManager: HealthStoreManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private lazy var stackView: UIStackView = {
     let stackView = UIStackView()
     stackView.axis = .vertical
@@ -106,7 +107,7 @@ class GalleryViewController: UIViewController {
     versionManager: VersionManager,
     goalManager: GoalManager,
     healthStoreManager: HealthStoreManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     coordinator: MainCoordinator
   ) {
     self.currentUserManager = currentUserManager
@@ -502,6 +503,17 @@ extension GalleryViewController: UICollectionViewDelegate {
   }
 }
 
+extension GalleryViewController: UICollectionViewDataSourcePrefetching {
+  func collectionView(_ collectionView: UICollectionView, prefetchItemsAt indexPaths: [IndexPath]) {
+    let urls = indexPaths.compactMap { indexPath -> URL? in
+      let goal = fetchedResultsController.object(at: indexPath)
+      return try? goal.thumbUrl.asURL()
+    }
+    let downloader = ServiceLocator.imageDownloader
+    urls.forEach { downloader.download(URLRequest(url: $0), completion: { _ in }) }
+  }
+}
+
 extension GalleryViewController {
   static private var preferredSort: [NSSortDescriptor] {
     let selectedGoalSort =
diff --git a/BeeSwift/GoalView/EditDatapointViewController.swift b/BeeSwift/GoalView/EditDatapointViewController.swift
index a9a36e3c5..12faabf9a 100644
--- a/BeeSwift/GoalView/EditDatapointViewController.swift
+++ b/BeeSwift/GoalView/EditDatapointViewController.swift
@@ -21,10 +21,10 @@ class EditDatapointViewController: UIViewController, UITextFieldDelegate {
   fileprivate var datePicker = InlineDatePicker()
   fileprivate var valueField = UITextField()
   fileprivate var commentField = UITextField()
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private let goalManager: GoalManager
 
-  init(goal: Goal, datapoint: DataPoint, requestManager: RequestManager, goalManager: GoalManager) {
+  init(goal: Goal, datapoint: DataPoint, requestManager: RequestManaging, goalManager: GoalManager) {
     self.goal = goal
     self.datapoint = datapoint
     self.requestManager = requestManager
diff --git a/BeeSwift/GoalView/GoalSettingsViewController.swift b/BeeSwift/GoalView/GoalSettingsViewController.swift
index e8acf3666..864158808 100644
--- a/BeeSwift/GoalView/GoalSettingsViewController.swift
+++ b/BeeSwift/GoalView/GoalSettingsViewController.swift
@@ -11,7 +11,7 @@ class GoalSettingsViewController: UIViewController {
   fileprivate let cellReuseIdentifier = "goalSettingsTableViewCell"
   let goal: Goal
   private let currentUserManager: CurrentUserManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private let goalManager: GoalManager
   private weak var coordinator: MainCoordinator?
 
@@ -27,7 +27,7 @@ class GoalSettingsViewController: UIViewController {
   init(
     goal: Goal,
     currentUserManager: CurrentUserManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     goalManager: GoalManager,
     coordinator: MainCoordinator
   ) {
diff --git a/BeeSwift/GoalView/GoalViewController.swift b/BeeSwift/GoalView/GoalViewController.swift
index b722b29b6..331bffbe4 100644
--- a/BeeSwift/GoalView/GoalViewController.swift
+++ b/BeeSwift/GoalView/GoalViewController.swift
@@ -28,7 +28,7 @@ class GoalViewController: UIViewController, UIScrollViewDelegate, DatapointTable
   let goal: Goal
   private let healthStoreManager: HealthStoreManager
   private let goalManager: GoalManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private let currentUserManager: CurrentUserManager
   private let viewContext: NSManagedObjectContext
   private weak var coordinator: MainCoordinator?
@@ -61,7 +61,7 @@ class GoalViewController: UIViewController, UIScrollViewDelegate, DatapointTable
     goal: Goal,
     healthStoreManager: HealthStoreManager,
     goalManager: GoalManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     currentUserManager: CurrentUserManager,
     viewContext: NSManagedObjectContext,
     coordinator: MainCoordinator
diff --git a/BeeSwift/GoalView/TimerViewController.swift b/BeeSwift/GoalView/TimerViewController.swift
index d0718a2f7..6ebe3e300 100644
--- a/BeeSwift/GoalView/TimerViewController.swift
+++ b/BeeSwift/GoalView/TimerViewController.swift
@@ -20,10 +20,10 @@ class TimerViewController: UIViewController {
   var timingSince: Date?
   var timer: Timer?
   private let units: TimerUnit
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
 
   var accumulatedSeconds = 0
-  init(goal: Goal, requestManager: RequestManager) {
+  init(goal: Goal, requestManager: RequestManaging) {
     self.goal = goal
     self.requestManager = requestManager
     self.units = Self.timerUnit(goal: goal) ?? .hours
diff --git a/BeeSwift/MainCoordinator.swift b/BeeSwift/MainCoordinator.swift
index 39ee7e9f7..403372c7f 100644
--- a/BeeSwift/MainCoordinator.swift
+++ b/BeeSwift/MainCoordinator.swift
@@ -9,7 +9,7 @@ class MainCoordinator {
   private let versionManager: VersionManager
   private let goalManager: GoalManager
   private let healthStoreManager: HealthStoreManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   init(
     navigationController: UINavigationController,
     currentUserManager: CurrentUserManager,
@@ -17,7 +17,7 @@ class MainCoordinator {
     versionManager: VersionManager,
     goalManager: GoalManager,
     healthStoreManager: HealthStoreManager,
-    requestManager: RequestManager
+    requestManager: RequestManaging
   ) {
     self.navigationController = navigationController
     self.currentUserManager = currentUserManager
diff --git a/BeeSwift/Settings/ChooseHKMetricViewController.swift b/BeeSwift/Settings/ChooseHKMetricViewController.swift
index 3cafd9aaf..578291672 100644
--- a/BeeSwift/Settings/ChooseHKMetricViewController.swift
+++ b/BeeSwift/Settings/ChooseHKMetricViewController.swift
@@ -17,10 +17,14 @@ class ChooseHKMetricViewController: UIViewController {
   fileprivate var tableView = UITableView()
   let goal: Goal
   private let healthStoreManager: HealthStoreManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private weak var coordinator: MainCoordinator?
-  init(goal: Goal, healthStoreManager: HealthStoreManager, requestManager: RequestManager, coordinator: MainCoordinator)
-  {
+  init(
+    goal: Goal,
+    healthStoreManager: HealthStoreManager,
+    requestManager: RequestManaging,
+    coordinator: MainCoordinator
+  ) {
     self.goal = goal
     self.healthStoreManager = healthStoreManager
     self.requestManager = requestManager
diff --git a/BeeSwift/Settings/ConfigureHKMetricViewController.swift b/BeeSwift/Settings/ConfigureHKMetricViewController.swift
index bad4a2658..e615ff517 100644
--- a/BeeSwift/Settings/ConfigureHKMetricViewController.swift
+++ b/BeeSwift/Settings/ConfigureHKMetricViewController.swift
@@ -25,7 +25,7 @@ class ConfigureHKMetricViewController: UIViewController {
   private let goal: Goal
   private let metric: HealthKitMetric
   private let healthStoreManager: HealthStoreManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private let goalManager: GoalManager?
 
   private var isRequestInFlight = false
@@ -47,7 +47,7 @@ class ConfigureHKMetricViewController: UIViewController {
     goal: Goal,
     metric: HealthKitMetric,
     healthStoreManager: HealthStoreManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     goalManager: GoalManager? = nil
   ) {
     self.goal = goal
diff --git a/BeeSwift/Settings/ConfigureNotificationsViewController.swift b/BeeSwift/Settings/ConfigureNotificationsViewController.swift
index 84275e354..d8e6403e0 100644
--- a/BeeSwift/Settings/ConfigureNotificationsViewController.swift
+++ b/BeeSwift/Settings/ConfigureNotificationsViewController.swift
@@ -20,7 +20,7 @@ class ConfigureNotificationsViewController: UIViewController {
   private let goalManager: GoalManager
   private let viewContext: NSManagedObjectContext
   private let currentUserManager: CurrentUserManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private weak var coordinator: MainCoordinator?
   private lazy var dataSource: NotificationsTableViewDiffibleDataSource = {
     NotificationsTableViewDiffibleDataSource(goals: [], tableView: tableView)
@@ -29,7 +29,7 @@ class ConfigureNotificationsViewController: UIViewController {
     goalManager: GoalManager,
     viewContext: NSManagedObjectContext,
     currentUserManager: CurrentUserManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     coordinator: MainCoordinator
   ) {
     self.goalManager = goalManager
diff --git a/BeeSwift/Settings/EditDefaultNotificationsViewController.swift b/BeeSwift/Settings/EditDefaultNotificationsViewController.swift
index fe08370a2..f883ea6f6 100644
--- a/BeeSwift/Settings/EditDefaultNotificationsViewController.swift
+++ b/BeeSwift/Settings/EditDefaultNotificationsViewController.swift
@@ -15,12 +15,12 @@ class EditDefaultNotificationsViewController: EditNotificationsViewController {
   private let logger = Logger(subsystem: "com.beeminder.beeminder", category: "EditDefaultNotificationsViewController")
   private let user: User
   private let currentUserManager: CurrentUserManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private let goalManager: GoalManager
   private let viewContext: NSManagedObjectContext
   init(
     currentUserManager: CurrentUserManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     goalManager: GoalManager,
     viewContext: NSManagedObjectContext
   ) {
diff --git a/BeeSwift/Settings/EditGoalNotificationsViewController.swift b/BeeSwift/Settings/EditGoalNotificationsViewController.swift
index b42105af4..c7ba73177 100644
--- a/BeeSwift/Settings/EditGoalNotificationsViewController.swift
+++ b/BeeSwift/Settings/EditGoalNotificationsViewController.swift
@@ -19,13 +19,13 @@ class EditGoalNotificationsViewController: EditNotificationsViewController {
   let goal: Goal
   fileprivate var useDefaultsSwitch = UISwitch()
   private let currentUserManager: CurrentUserManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private let goalManager: GoalManager
   private let viewContext: NSManagedObjectContext
   init(
     goal: Goal,
     currentUserManager: CurrentUserManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     goalManager: GoalManager,
     viewContext: NSManagedObjectContext
   ) {
diff --git a/BeeSwift/Settings/HealthKitConfigViewController.swift b/BeeSwift/Settings/HealthKitConfigViewController.swift
index dec31531b..b9409ce53 100644
--- a/BeeSwift/Settings/HealthKitConfigViewController.swift
+++ b/BeeSwift/Settings/HealthKitConfigViewController.swift
@@ -23,13 +23,13 @@ class HealthKitConfigViewController: UIViewController {
   private let goalManager: GoalManager
   private let viewContext: NSManagedObjectContext
   private let healthStoreManager: HealthStoreManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private weak var coordinator: MainCoordinator?
   init(
     goalManager: GoalManager,
     viewContext: NSManagedObjectContext,
     healthStoreManager: HealthStoreManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     coordinator: MainCoordinator
   ) {
     self.goalManager = goalManager
diff --git a/BeeSwift/Settings/SettingsViewController.swift b/BeeSwift/Settings/SettingsViewController.swift
index 422aa7263..b66118f6f 100644
--- a/BeeSwift/Settings/SettingsViewController.swift
+++ b/BeeSwift/Settings/SettingsViewController.swift
@@ -18,13 +18,13 @@ class SettingsViewController: UIViewController {
   private let currentUserManager: CurrentUserManager
   private let viewContext: NSManagedObjectContext
   private let goalManager: GoalManager
-  private let requestManager: RequestManager
+  private let requestManager: RequestManaging
   private weak var coordinator: MainCoordinator?
   init(
     currentUserManager: CurrentUserManager,
     viewContext: NSManagedObjectContext,
     goalManager: GoalManager,
-    requestManager: RequestManager,
+    requestManager: RequestManaging,
     coordinator: MainCoordinator
   ) {
     self.currentUserManager = currentUserManager