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!