I'm stumped and need some help.
Our site (which is heavily trafficed) has been taking over 30 seconds to post a comment to the point where the script times out and we get a 500 error. deleting a comment is the same. In both cases the comment does get saved, but we get the error. We're also getting timeouts on publishing a post.
Fearing a conflict, I disabled all plugins and went to the Twenty Twelve theme. Problem is still there.
I optimized the comments table, deleted post revisions, etc. still seeing the problem.
TOP on the server shows low activity and show processlist on mysql doesn't look like there's any real load on the DB,.
I'm stumped, any pointers?