Counter-Strike grenade - FPS drop

Hello guys, i was woundering why im laaging/ FPS drop when im seeing a grenade in cs 1,6 my fps start with 100 and then go down at the moment i see a grenade

Im currently using a Macbook Pro but i downloaded windows 7 on it so i can play cs propably
More info about my Mac:

i7 core
2,7 Ghz
4 GB ram
Intel HD 3000


Please help me since its important for me
thanks for your time.
 
anti-aliasing (Smoothing out the jagged edges)

Should be able to disable it in the options in game settings, unless you have your graphics card settings set to over-rid application settings.

yea anti aliasing will make it look better but most graphic cards don't handle it well
 
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