[gardening] Mark more tests slow

Change-Id: I25c9e14b8831de910ba15999f9823604bf5a6885
Reviewed-on: https://dart-review.googlesource.com/c/78402
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>
diff --git a/runtime/observatory/tests/service/service_kernel.status b/runtime/observatory/tests/service/service_kernel.status
index 3a44a8f..da4c183 100644
--- a/runtime/observatory/tests/service/service_kernel.status
+++ b/runtime/observatory/tests/service/service_kernel.status
@@ -109,10 +109,11 @@
 [ $compiler == dartk ]
 add_breakpoint_rpc_test: SkipByDesign # non-kernel specific version of add_breakpoint_rpc_kernel_test.
 bad_reload_test: RuntimeError # Issue 34025
+coverage_optimized_function_test: Pass, Slow
 evaluate_activation_in_method_class_test: RuntimeError
 evaluate_activation_test/instance: RuntimeError # http://dartbug.com/20047
 evaluate_activation_test/scope: RuntimeError # http://dartbug.com/20047
-pause_on_unhandled_async_exceptions_test2: Pass, Slow
+pause_on_unhandled_async_exceptions2_test: Pass, Slow
 step_through_arithmetic_test: RuntimeError # probably constant evaluator pre-evaluating e.g. 1+2
 unused_changes_in_last_reload_test: RuntimeError
 
@@ -148,6 +149,7 @@
 [ $compiler == dartk && $mode == debug ]
 isolate_lifecycle_test: Skip # Flaky.
 pause_idle_isolate_test: Skip # Flaky
+rewind_optimized_out_test: Pass, Slow
 
 [ $compiler == dartk && $system == windows ]
 break_on_default_constructor_test: Skip # Issues 32137 and 32138.
diff --git a/tests/standalone_2/standalone_2_kernel.status b/tests/standalone_2/standalone_2_kernel.status
index bd1aff3..9b670a5 100644
--- a/tests/standalone_2/standalone_2_kernel.status
+++ b/tests/standalone_2/standalone_2_kernel.status
@@ -155,6 +155,7 @@
 map_insert_remove_oom_test: Skip # Heap limit too low.
 
 [ $system == windows && ($compiler == dartk || $compiler == dartkb) ]
+io/dart_std_io_pipe_test: Pass, Slow
 io/secure_builtin_roots_test: Skip # Issues 32137 and 32138.
 io/test_extension_fail_test: RuntimeError, Pass # Issue 32137.
 io/test_extension_test: RuntimeError, Pass # Issue 32137.