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More often than not XOOPS performance issues come down to what modules you are using and/or wether or not you are utilising the XOOPS caching system fully.
If it is slow due to the modules you are using, then you will be best off to contact the modules developer. If it is caching then read on
. Module caching, while worth it, is not usually the culprit when it comes to performance. Most sites are dominated by blocks, and it is these blocks that are (as a group) going to knock your site performance around the head like a red headed stepchild. Have a read of
this thread where we were able to reduce the page execution time from a high of 4 seconds down to a pretty consistant 0.09 seconds, simply by using the XOOPS caching functionality.