diff --git a/jest.config.js b/jest.config.js
index 5ac7b3846b..c5a2969445 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -9,7 +9,8 @@ module.exports = {
   testPathIgnorePatterns: ['test/fixtures/.*/.*?/'],
   moduleFileExtensions: ['js', 'mjs', 'json'],
   expand: true,
-  forceExit: true,
+  forceExit: true
   // https://github.com/facebook/jest/pull/6747 fix warning here
-  detectOpenHandles: true
+  // But its performance overhead is pretty bad (30+%).
+  // detectOpenHandles: true
 }