Left 4 dead pc lag

i know i have to disable the multicore rendering to stop the lag in my game, but im no good at all at this computer stuff, so ya. i don't even know HOW to disable it. could someone tell me STEP BY STEP please :)
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More about left dead
  1. Have you tried the site for the company that makes the game? More likely to get an answer there.
  2. What are your pc's specs?
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