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joomodle plugin "hook user" and jomsocial users module
I hard to make sure what caused it. I suggest you to increase memory limit at your PHP settings. please ask your hosting support if you don't know how to do it.
JCH Optimize Pro plugin not used before? or just now?.
I suggest you to disabling some installed plugins (unnecessary plugin). at put module we already using limit at our query. the query time not more than 1 sec.
the best way is increase the PHP memory limit. too bad if your hosting not allowed.