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I personally experienced this issue before.
Many would argue me wrong but since the date I install xoops, the server runs at it highest capability or something, keep crashing and server response extremely slowly. I have DonXoops helped me out which he recommanded
1. Have it compile into html script instead of php. This helped alot
2. Caches for nonupdating modules
3. Don't use the "who's online" modules or any other block that's not neccessary and consist a lot of scripting.
I also have switcheed to a better server, dedicated server with Dual Xeon and it still consumes a lot of RAM and CPU
Here is the picture of my server