diff --git a/pkg/test_runner/lib/src/runtime_configuration.dart b/pkg/test_runner/lib/src/runtime_configuration.dart
index e9c59b869ac5..e49416bf8588 100644
--- a/pkg/test_runner/lib/src/runtime_configuration.dart
+++ b/pkg/test_runner/lib/src/runtime_configuration.dart
@@ -356,8 +356,9 @@ class DartVmRuntimeConfiguration extends RuntimeConfiguration {
     if (arch == Architecture.ia32) {
       multiplier *= 2;
     }
-    if (arch == Architecture.x64 && system == System.mac) {
-      multiplier *= 2; // Older, slower machines.
+    if ((arch == Architecture.x64 && system == System.mac) ||
+        (arch == Architecture.arm64 && system == System.win)) {
+      multiplier *= 2; // Slower machines.
     }
 
     if (mode.isDebug) {
diff --git a/tests/co19/co19-runtime.status b/tests/co19/co19-runtime.status
index cf9e2ac6f537..8a5e66de063b 100644
--- a/tests/co19/co19-runtime.status
+++ b/tests/co19/co19-runtime.status
@@ -2,8 +2,10 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+LibTest/io/FileSystemModifyEvent/*: Pass, Slow
+LibTest/io/FileSystemMoveEvent/*: Pass, Slow
+
 [ $system == windows ]
-LibTest/io/FileSystemModifyEvent/contentChanged_A01_t01: Pass, Slow
 LibTest/io/ProcessResult/exitCode_A01_t02: Skip # Issue 32138
 LibTest/io/Stdin/readByteSync_A01_t01: Skip # Issue 32138
 LibTest/io/Stdin/readByteSync_A01_t02: Skip # Issue 32138