Running vBulletin Suite 4.2.5 I recently downgraded from a dedicated server to a VPS to save costs: CENTOS 7.3 WHM v66.0.18 running PHP 7.1.9 48 processors, each listed as: Intel(R) Xeon(R) CPU E5-2670 v3 @ 2.30GHz, Cache 30720 KB RAM: 6GB Storage: 150GB Bandwidth: 5TB Settings (these have been tweaked and produced some improvement but intermittent problem still exists): PHP Max Post Size 1.00 GB PHP Maximum Upload Size 1.00 GB PHP Memory Limit 1.00 GB MySQL Version 10.2.8-MariaDB MySQL Packet Size 512.00 MB Problem: When starting a new thread or posting a reply to an existing thread, it is very slow with the post taking several seconds to complete. Often it then pops up a warning message saying I am asking to leave the page - stay on page? leave page? If I dismiss that and refresh the page, the post is there. However, many members faced with the slow posting or the warning click submit again, resulting in double or even triple posts. None of these were issues on my previous dedicated server. Additional information: This is most likely to happen on the first post/reply of the day. After that, the posts seem to go through normally with no errors or double posts (at least for me on a desktop with a high speed connection). Question: Any idea what is likely to be causing this and what I can do to fix it?