I have been having a lot of issues with wordpress plugins and server performance.
It seems some poorly coded wordpress plugins (non WPMUDEV) get installed due to their interesting feature capability but bog down the wordpress install as a whole.
It seems, the only solution to find out which plugin causes the issue to to uninstall it (deactivate and delete) and wait.. or send robots in as pretend users to test performance.
Is it possible - to manage the plugins more effectively.
Perhaps a plugin the adds quick stats on the plugins page displaying SQL access usage, memory usage, error logs....
or would this in fact cause more server load and be detrimental.