For better results you should install and enable Memcached, and wait until the plugin generates cache for static files.  If you still have any issues please contact me via PM, I'll check if plugin works properly myself. 

memcache, or memcached, or both??? Any other suggested modules i need to have? also what is the suggested php version on the server for this to work excellent???

I can select the php version so please let me know what are your suggestions in order to see a difference... Up to now i see my site stucking (like holding)

thank you so much!