write:(counter strike source)
-console in launch options in steam to get console forward when u start game.

if u have counter strike 1,6 then push | to get console forward.

then copy this under and cut it in console. then maybe it should be better if that not help then is your internett or computer.. then u need money to buy better and that i cant help u whit^^

typ this in console:
rate 25000
cl_updaterate 101
cl_cmdrate 101
cl_rate 9999
ex_interp 0.01