diff --git a/dart/lib/concurrency.dart b/dart/lib/concurrency.dart
index 060ef62..9fd4810 100644
--- a/dart/lib/concurrency.dart
+++ b/dart/lib/concurrency.dart
@@ -39,7 +39,7 @@ void spawnTicket(RandomAccessFile file, {
     int count = expSleepTracker[label] ?? 0;
     int sleepTime = (1 << count); // Exponential backoff
     // sleepTime = max(1, min(sleepTime, 1000)); // Clamp between 1ms and 1000ms
-    preciseSleep(Duration(microseconds: sleepTime * 5000));
+    preciseSleep(Duration(microseconds: sleepTime * 1000));
     expSleepTracker[label] = count + 1;
   }
 
diff --git a/dart/lib/helpers.dart b/dart/lib/helpers.dart
index 8622f55..1075005 100644
--- a/dart/lib/helpers.dart
+++ b/dart/lib/helpers.dart
@@ -234,20 +234,18 @@ void preciseSleep(Duration duration) {
 
   if (Platform.isWindows) {
     if (duration < _windowsMinSleepTime) {
-      // Pure busy-wait for very short durations
-      final end = DateTime.now().add(duration);
-      while (DateTime.now().isBefore(end)) {}
+      // Pure busy-wait with high-res timer
+      while (stopwatch.elapsed < duration) {}
     } else {
       // Hybrid: sleep most of it, busy-wait the remainder
       final sleepDuration = duration - _windowsMinSleepTime;
       sleep(sleepDuration);
-      final end = DateTime.now().add(_windowsMinSleepTime);
-      while (DateTime.now().isBefore(end)) {}
+      while (stopwatch.elapsed < duration) {}
     }
   } else {
     sleep(duration);
   }
 
   stopwatch.stop();
-  print('preciseSleep: requested ${duration.inMicroseconds}μs, actual ${stopwatch.elapsedMicroseconds}μs, diff ${stopwatch.elapsedMicroseconds - duration.inMicroseconds}μs');
+  // print('preciseSleep: requested ${duration.inMicroseconds}μs, actual ${stopwatch.elapsedMicroseconds}μs, diff ${stopwatch.elapsedMicroseconds - duration.inMicroseconds}μs');
 }
\ No newline at end of file