Ive started benchmarking my xF install and have noticed an interesting issue. Without any caching configured, load testing my xF install shows 750 requests/sec. When I enable front end caching as described here - http://xenforo.com/help/cache/ - my performance drops to 305 requests/second. When I enable both front end caching and back end caching just using the file system, performance drops to 143 requests/second with nearly doubling the time per request. Does anyone know why I would see a decrease in performance instead of an improvement when caching is enabled? I havent even tested APC or memcache, the goal was to just test simple filesystem caching before we get more aggressive. Any tips appreciated!