XF 1.5 Replying to big threads very slow

Peace

Active member
Posting new threads (and replies to smaller threads) are totally speedy, but recently we are noticing that replies to bigger threads (5,000+ posts long) are taking way too long; anywhere from 5-30 seconds. The little black thing in the top right-hand corner just keeps spinning away until finally posting.

Does xenForo have the same issue with vBulletin and big threads? Or is there something I should repair / optimize?

Thanks!
 
There are sites with threads with many times that number of posts so it's not a general issue.

Do you currently have any issues with sending email from the forum?
I have seen email related problems manifest themselves in that way.

Does the same thing happen with all add-ons disabled?
 
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