Yes the AI detects you if you shoot at it, but not otherwise, then again grass generates like 50m from you thus not blocking any AI view pass that range so it is ok.
If you mean performance - I set a lower grass density and get a pretty playable framerate considering all other stuff on the screen and 2km view distance on my old Athlon XP 2500+ and GF 6600 256 MBs. I have a better rig though - dual core 5200+ with Radeon 4670 - there it works like a charm.
(But I mostly play infantry/small specops missions when in SP anyway)
If you mean performance - I set a lower grass density and get a pretty playable framerate considering all other stuff on the screen and 2km view distance on my old Athlon XP 2500+ and GF 6600 256 MBs. I have a better rig though - dual core 5200+ with Radeon 4670 - there it works like a charm.
(But I mostly play infantry/small specops missions when in SP anyway)