diff --git a/etc/taskcluster/decision_task.py b/etc/taskcluster/decision_task.py
index 1f8b0a1d12a..64e3d898335 100644
--- a/etc/taskcluster/decision_task.py
+++ b/etc/taskcluster/decision_task.py
@@ -687,7 +687,7 @@ def linux_wpt_common(total_chunks, layout_2020):
     def linux_run_task(name):
         return linux_task(name).with_dockerfile(dockerfile_path("run")).with_repo_bundle()
     wpt_chunks("Linux x64", linux_run_task, release_build_task, repo_dir="/repo",
-               processes=12, total_chunks=total_chunks, layout_2020=layout_2020)
+               processes=20, total_chunks=total_chunks, layout_2020=layout_2020)
 
 
 def wpt_chunks(platform, make_chunk_task, build_task, total_chunks, processes,
diff --git a/tests/wpt/metadata/webdriver/tests/execute_script/cyclic.py.ini b/tests/wpt/metadata/webdriver/tests/execute_script/cyclic.py.ini
index f3d1649f33c..81f7b00c745 100644
--- a/tests/wpt/metadata/webdriver/tests/execute_script/cyclic.py.ini
+++ b/tests/wpt/metadata/webdriver/tests/execute_script/cyclic.py.ini
@@ -3,4 +3,5 @@
     expected: FAIL
 
   [test_element_in_collection]
-    expected: FAIL
+    expected:
+      if os == "mac": FAIL