High CPU usage while idle (perhaps specifically on Windows)

https://github.com/jlowin/fastmcp/issues/2887
https://github.com/taylorwilsdon/google_workspace_mcp/issues/456

The community has already done some solid debugging here, just need to get a reproducible setup for testing this.