128 megs of ram should be enough for most things you throw at it. I'd recommend getting yourself either a voodoo3 (2000 or 3000 it doesn't matter a whole lot) or, if you can afford it, a Geforce 256 DDR/SDR. The geforce 256 DDR has twice as fast ram as an SDR but they're both very fast cards. I have a lowly celeron 266 w/ no level 2 cache overclocked to 400 mhz & 64 megs of ram with a geforce and I get NO swapping at all in anything. Also, have you defragged your hard drive yet? If not do so. Then, if you have the space, set up a permanent swap file of around 250-300 megs. Only do the swap file thing after you've defragged though otherwise you'd have a fragmented swap file and nothing was gained. This should help. Check around on pricewatch.com or ebay for the video cards. You can find some pretty good deals at either place.

Thanks for the advice.

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Six out of five people have trouble with fractions.

Ten out of ten constipated people couldn't give a shit.

You probably either have:

incorrect video drivers or video driver set-up. Or OpenGL setup.

Or, incorrect AGP buss driver setup (if your card is AGP?)

or a whole bunch of crap running in the background.

or maybe crippled BIOS settings, especially memory, cache, and PCI buss settings.

Swapping is ALWAYS because of low RAM. Anyway, if you cant afford 1/4 or 1/2 Gigas of RAM, check the virtual memory settings, and make a BIG swap-file, the double of the RAM size is usually good enough. The swap will be in one piece phisically on the winchester, and its much faster than its fragmented, or Windows-optimized.
Fast winchester is recommended also, as the games recommended videocard-driver version.
Hope it help.

(My friends are hardcore FPS-gamers with tuning-mania. One of them has six ventillators in his server-house. Hail to da Overclockers.