From c31e63df80c41a4845cc3f8793621ab6850c6c3a Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Mon, 1 Dec 2025 14:21:26 -0800
Subject: [PATCH 1/2] fix(NODE-7307): Replace node:process.hrtime() with
 performance.now()

---
 src/utils.ts            |  3 +--
 test/unit/utils.test.ts | 12 ++++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/utils.ts b/src/utils.ts
index 49aa15ccea4..e6638ed27cf 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -436,8 +436,7 @@ export function makeStateMachine(stateTable: StateTable): StateTransitionFunctio
 
 /** @internal */
 export function now(): number {
-  const hrtime = process.hrtime();
-  return Math.floor(hrtime[0] * 1000 + hrtime[1] / 1000000);
+  return Math.floor(performance.now());
 }
 
 /** @internal */
diff --git a/test/unit/utils.test.ts b/test/unit/utils.test.ts
index dc393fe0990..c2f87afb5a7 100644
--- a/test/unit/utils.test.ts
+++ b/test/unit/utils.test.ts
@@ -21,6 +21,7 @@ import {
   List,
   MongoDBCollectionNamespace,
   MongoDBNamespace,
+  now,
   shuffle
 } from '../../src/utils';
 import { sleep } from '../tools/utils';
@@ -1285,4 +1286,15 @@ describe('driver utils', function () {
       });
     });
   });
+
+  describe('now()', () => {
+    it('difference between two calls is close to sleep time', async () => {
+      const time1 = now();
+      await sleep(10);
+      const time2 = now();
+      const diff = time2 - time1;
+      expect(diff).to.be.gte(5);
+      expect(diff).to.be.lte(15);
+    });
+  });
 });

From 36ab7b1f7291df27e7b6b4d941ef1157552ea3ac Mon Sep 17 00:00:00 2001
From: Pavel Safronov <pavel.safronov@gmail.com>
Date: Tue, 2 Dec 2025 15:11:22 -0800
Subject: [PATCH 2/2] remove unnecessary test

---
 test/unit/utils.test.ts | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/test/unit/utils.test.ts b/test/unit/utils.test.ts
index c2f87afb5a7..dc393fe0990 100644
--- a/test/unit/utils.test.ts
+++ b/test/unit/utils.test.ts
@@ -21,7 +21,6 @@ import {
   List,
   MongoDBCollectionNamespace,
   MongoDBNamespace,
-  now,
   shuffle
 } from '../../src/utils';
 import { sleep } from '../tools/utils';
@@ -1286,15 +1285,4 @@ describe('driver utils', function () {
       });
     });
   });
-
-  describe('now()', () => {
-    it('difference between two calls is close to sleep time', async () => {
-      const time1 = now();
-      await sleep(10);
-      const time2 = now();
-      const diff = time2 - time1;
-      expect(diff).to.be.gte(5);
-      expect(diff).to.be.lte(15);
-    });
-  });
 });