I couldn't find a post with a similar problem, so I'll explain the issue:
every time my character draws his weapon I get a sound lag of 2-3 seconds. The "drawing weapon sound" comes afterwards, when the weapon is already drawn.
I've been a couple months without playing and I just reinstalled the game again, but I don't recall this issue.
Creative X-Fi Gamer
4 GB DDR2 800
Core2Duo E8500 3.16 (3.8 at the moment)