Cant play experimental

Now I know i dont have the best PC but i really didnt think I had a bad one either as I can play many games on highest settings with no problems. anyway It takes longer for me to load the game then other players I know. and once in game with EVERYTHING on lowest including res. and all the f2 settings i lag as soon as i hit a rock or tree. if i swing the rock and hit nothing im fine but as soon as i connect i get a 5 sec screen freeze. my ram is at 60% and cpu is at 80% pc hardware is as follows.

core 2 duo E8400 @3.0
4gb 6400 ram
evga 560 gtx
250gb SSD
600 watt PSU

dude that problem is gone 22/09/2014 on my PC.