diff --git a/pkg/test_runner/lib/src/configuration.dart b/pkg/test_runner/lib/src/configuration.dart
index 010f0005aa2c..065f180d9f84 100644
--- a/pkg/test_runner/lib/src/configuration.dart
+++ b/pkg/test_runner/lib/src/configuration.dart
@@ -245,7 +245,7 @@ class TestConfiguration {
             arch: architecture,
             system: system);
 
-        _timeout = 60 * compilerMultiplier * runtimeMultiplier;
+        _timeout = 30 * compilerMultiplier * runtimeMultiplier;
       }
     }
 
diff --git a/pkg/test_runner/lib/src/runtime_configuration.dart b/pkg/test_runner/lib/src/runtime_configuration.dart
index de784ee233ab..e9c59b869ac5 100644
--- a/pkg/test_runner/lib/src/runtime_configuration.dart
+++ b/pkg/test_runner/lib/src/runtime_configuration.dart
@@ -356,6 +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 (mode.isDebug) {
       multiplier *= 2;
diff --git a/runtime/tests/vm/vm.status b/runtime/tests/vm/vm.status
index 9c8833476ddd..ae99e70687e6 100644
--- a/runtime/tests/vm/vm.status
+++ b/runtime/tests/vm/vm.status
@@ -13,6 +13,7 @@ cc/IsolateReload_PendingUnqualifiedCall_InstanceToStatic: Fail # Issue 32981
 cc/IsolateReload_PendingUnqualifiedCall_StaticToInstance: Fail # Issue 32981
 cc/TTS_STC_ManyAsserts: Pass, Slow # Generates 10k classes that are put into an STC via assert checks.
 dart/analyze_snapshot_binary_test: Pass, Slow # Runs various subprocesses for testing AOT.
+dart/async_igoto_threshold_flag_test: Pass, Slow
 dart/boxmint_test: Pass, Slow # Uses slow path
 dart/byte_array_optimized_test: Pass, Slow
 dart/byte_array_test: Pass, Slow # Uses --opt-counter-threshold=10
@@ -30,6 +31,7 @@ dart/print_object_layout_test: Pass, Slow # Spawns several subprocesses
 dart/regress32619_test: Pass, Slow
 dart/slow_path_shared_stub_test: Pass, Slow # Uses --shared-slow-path-triggers-gc flag.
 dart/snapshot_version_test: Skip # This test is a Dart1 test (script snapshot)
+dart/spawn_uri_aot_test: Pass, Slow # Runs various subprocesses for testing AOT.
 dart/stack_overflow_shared_test: Pass, Slow # Uses --shared-slow-path-triggers-gc flag.
 
 [ $arch == ia32 ]
diff --git a/tests/co19/co19-runtime.status b/tests/co19/co19-runtime.status
index 3f8d75a18d80..cf9e2ac6f537 100644
--- a/tests/co19/co19-runtime.status
+++ b/tests/co19/co19-runtime.status
@@ -3,6 +3,7 @@
 # BSD-style license that can be found in the LICENSE file.
 
 [ $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