diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index bde24c3..e282377 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -2,7 +2,7 @@ name: Build and Test
 
 on:
   push:
-    branches: [ "main" ]
+    branches: [ "main" , "arm"]
   pull_request:
     branches: [ "main" ]
 
diff --git a/README.md b/README.md
index 0c5e7d7..8205a65 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ cmake ..
 cmake --build . --config Release
 ```
 ## Results
-
+- x64
 ```bash
 Map order book
 Latency (cycles)
@@ -34,3 +34,20 @@ Latency (cycles)
   p99: 3520
   p99.9: 5640
   ```
+
+- ARM
+```bash
+Map order book
+Latency (cycles)
+  p50: 42
+  p90: 84
+  p99: 167
+  p99.9: 1167
+
+Vector order book
+Latency (cycles)
+  p50: 42
+  p90: 125
+  p99: 375
+  p99.9: 625
+  ```
\ No newline at end of file
diff --git a/include/orderbook/timing.hpp b/include/orderbook/timing.hpp
index 5bc965e..4875040 100644
--- a/include/orderbook/timing.hpp
+++ b/include/orderbook/timing.hpp
@@ -1,21 +1,28 @@
 #pragma once
 #include <cstdint>
+#include <chrono>
 
-#if defined(__x86_64__) || defined(_M_X64)
-#ifdef _MSC_VER
-#include <intrin.h>
-static inline uint64_t rdtsc()
-{
-    return __rdtsc();
+inline uint64_t now_ns() {
+    return std::chrono::duration_cast<std::chrono::nanoseconds>(
+        std::chrono::steady_clock::now().time_since_epoch()
+    ).count();
 }
-#else
-static inline uint64_t rdtsc()
-{
-    uint32_t lo, hi;
-    asm volatile("rdtsc" : "=a"(lo), "=d"(hi));
-    return (static_cast<uint64_t>(hi) << 32) | lo;
-}
-#endif
-#else
-#error "rdtsc only supported on x86_64"
-#endif
+
+// #if defined(__x86_64__) || defined(_M_X64)
+// #ifdef _MSC_VER
+// #include <intrin.h>
+// static inline uint64_t rdtsc()
+// {
+//     return __rdtsc();
+// }
+// #else
+// static inline uint64_t rdtsc()
+// {
+//     uint32_t lo, hi;
+//     asm volatile("rdtsc" : "=a"(lo), "=d"(hi));
+//     return (static_cast<uint64_t>(hi) << 32) | lo;
+// }
+// #endif
+// #else
+// #error "rdtsc only supported on x86_64"
+// #endif
diff --git a/src/dispatcher.cpp b/src/dispatcher.cpp
index 3552751..27dc483 100644
--- a/src/dispatcher.cpp
+++ b/src/dispatcher.cpp
@@ -8,7 +8,7 @@ void Dispatcher::run(
 {
     for (const auto &msg : feed.messages())
     {
-        uint64_t start = rdtsc();
+        uint64_t start = now_ns();
 
         switch (msg.type)
         {
@@ -31,7 +31,7 @@ void Dispatcher::run(
             break;
         }
 
-        uint64_t end = rdtsc();
+        uint64_t end = now_ns();
         recorder.record(end - start);
     }
 }