diff --git a/test/sea/testcfg.py b/test/sea/testcfg.py
index 341d23919334c2..3eb661072bc011 100644
--- a/test/sea/testcfg.py
+++ b/test/sea/testcfg.py
@@ -1,6 +1,20 @@
-import sys, os
+import sys, os, multiprocessing, shutil
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 import testpy
 
 def GetConfiguration(context, root):
-  return testpy.SimpleTestConfiguration(context, root, 'sea')
+  # We don't use arch-specific out folder in Node.js; use none/none to auto
+  # detect release mode from GetVm and get the path to the executable.
+  vm = context.GetVm('none', 'none')
+  if not os.path.isfile(vm):
+    return testpy.SimpleTestConfiguration(context, root, 'sea')
+
+  # Get the size of the executable to decide whether we can run tests in parallel.
+  executable_size = os.path.getsize(vm)
+  num_cpus = multiprocessing.cpu_count()
+  remaining_disk_space = shutil.disk_usage('.').free
+  # Give it a bit of leeway by multiplying by 3.
+  if (executable_size * num_cpus * 3 > remaining_disk_space):
+    return testpy.SimpleTestConfiguration(context, root, 'sea')
+
+  return testpy.ParallelTestConfiguration(context, root, 'sea')