CS 1.6 FPS problems @ smoke green

Hello. I have a problem with my fps when I play cs 1.6 and Im near smoke gren's puffs.

Usually I have like 70-99fps but when I'm near smoke puffs it goes down to ~20 (10 when Im in smoke). It's really annoying to play with this problem.

I have Win XP profesion, pc settings:

1GB ram
2.01 GHz
Video card: nvidia GeForce 6800 LE 512mb
v-cards settings:

V-sync - Force off
Anisoptoring - off
Perfomance - best perfomance
Smoothing - off
Triple buffering - off
Hardware acceleration - one device
Restriction of expansion - off
Inclusion of scale structures - off

desktop resolution/color quality: 1024x768 / Highest(32bit)
ingame resolution/color quality: 1024x768 / Highest(32bit) / Renderer: OpenGL

how should I improve my fps while near smoke gren's puffs ,without taking 16bits (illegal game setting)?
 
Replay to Supra

It only boosted my default fps a little bit.. I have still low fps on smoke, but thanks anyway
 
Check for the cards antialiasing settings, which might get used in preference to the in games settings. Antialiasing is always the killer on the smoke used in the source engine in my experience.
 
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