In addition to the server suggestions at vbulletin.com.
Upgrade MySQL.
Make sure you have the latest Apache 2 - we also had problems with a particular version. (Don't remember which one.)
Check the # of queries running on your site (per page) ...
Check each custom query and make sure
1)__ they are optimized
2)__ are using index whenever possible
3)__ ensure that SELECTs are retrieving from the SLAVE server and not the MASTER (check processlist)
NOTES
- only use necessary plugins - those that add value to your site
--- I recommend removing the arcade.
- vbseo has all their queries fetching from MASTER. :down:
- vbadvanced - I'm sure there's some queries that are going to MASTER when they should be going to SLAVE.
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