Two issues I first noticed yesterday.
- It sometimes takes a very long time loading threads and the browser progress indicator "gets stuck" about halfway and doesn't resolve even after waiting several minutes. Opening a new browser tab and reloading the page works most of the time.
- When I post comments, the browser progress indicator sometimes "gets stuck" about halfway and doesn't resolve even after waiting several minutes. But if I open a new tab and open the thread, my reply has been posted even though the action doesn't complete in the first tab.

I have seen this using Firefox, Chrome, and Safari. Clearing cookies and cache doesn't resolve the issue. I have not seen this on any other website. My internet upload and download speeds are normal.