Here is my userconfig. I have tweeked it so you don't see the weather effects in Aztec and the fog on some other maps and dead bodies are turned off plus a few other smaller tweeks to improve my fps.
cl_smooth 0
Rate 25000
cl_updaterate 101
cl_cmdrate 101
fog_enable 0
fog_enable_water_fog 0
r_rainradius 0
r_rainsimulate 0
r_rainsplashpercentage 0
cl_phys_props_enable 0
cl_phys_props_max 0
cl_ragdoll_physics_enable 0
mat_fastnobump 1
mat_fastspecular 1