Remove .pbo files from the addons folder, Launch client. While at the main menu add the pbo files back in to the addon folder and join a server.
This stops your client from loading the pbo files and when BE scans the addon folder it shows all pbo's present so when you join a server you dont have grass tree's etc...
Removing grass increase's FPS from 20 to 40+ So please make removing grass a legit option within the ingame settings.