Hi, James.

There's no known issues with Windows 7 - and no known issues where it hangs and/or slows down to a crawl after 30 seconds.

It may be, though, that your auto-save interval is set to something unreasonable (like 1 second), which might cause something like this.

For best support, send a support ticket from the Help menu in MultiPing - this will send your setup and we can do more investigation of the problem.

Best wishes,
Pete