Thread:Project:Support desk/Caching issue makes MediaWiki painfully slow/reply (2)

I think what's likely happening is that APC object cache size is too small (I think the apc.shm_size in php.ini controls that, not sure off the top of my head. xcache.var_size is equivalent setting for xcache i believe), so the i18n cache stuff can't be loaded from cache slowing things down. If APC caching is disabled, then the i18n cache gets stored in the db, which well slightly slower than APC, at least works. (setting manual:$wgCacheDirectory to something writable by the webserver might help with this situation).

If this is indeed what is happening, I think i18n cache is supposed to also go to db when using APC, which I guess is not happening, which sounds like a bug.