Basic info:

• Node.js version: 21.4.0
• jsdom version: 23.2.0

Minimal reproduction case

• Vitest tests with jsdom 23.1.0 (mm:ss):
  • Without coverage: 3:30
  • With coverage: 5:30
• Vitest tests with jsdom 23.2.0 (mm:ss):
  • Without coverage: 7:30
  • With coverage: 15:30

The hit to performance in 23.2.0 is quite significant, to the point that a handful of our unit tests doing no more than clicking and selecting using RTL are consistently timing out too now

I wanted to raise this as an issue as requested in the release notes for 23.2.0

How does similar code behave in browsers?

N/A