Lag With New Update

I've just updated Beam NG and it is very laggy now, especially on the New West Coast map. If anyone can help, thanks!

 

I only get like 6 fps on the new map

 

I'm running a 960, i5 and 12GB of ram and it used to run perfectly. I've found the lag comes when I load party occasionally

 

My r7 360 runs this map 30 fps (which Is fine by me but when I load up some mods it brings it down to 7 and bringing up a new mod that doesn't lag the game stays at 7, is this for another thread? ( Btw mods like the bluebird school bus work fine but mods like on the pigeon don't work, I hope this is a software problem not a bad hardware problem)

 

I noticed that I can no longer play the original EAST Coast USA at 60 FPS; it's more like 47 FPS (which, for some reason, feels much choppier than 47 FPS should).

 

delete vehicles folder under cache and hit CTRL R ingame this should restore FPS

it seems there's a leak in the vehicle cache folder upon multiple/consecutive vehicle part changes