After you put the config file in C:\Program files\steam\steamapps\username\counter-strike source\cstrike\cfg you need to right click on counterstrike source in your steam game library and then click properties, click set launch options and paste
"-heapsize 1048576 -high -dxlevel 80" without the quotes in the box then click ok and your done...
-heapsize = GBS of your RAM being used to play the game
-High = Sets the game to High Priority on your pc
-dxlevel 80 = uses Directx 8.0 Graphics on your pc (Directx 8.0 is for Low End users)
Link:
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