You guys helped me so well getting DP up running on this box, that I think maybe you could help me again

I put a junker together for my kid to play on LAN in the other room, and it's having problems.
Think it's a K6-2-400 and the has got like 48Mb ram on it, (4MB committed to video) and 98se installed. Old thing, but Q2 shouldn't require much more than 90mhz 16-25 Ram, right? Hardware acceleration is on full.
The int vid chip is SiS 530, and the game wouldn't start until I found the last driver made for it, which supposedly supports OpenGL.
So now the game starts, but there is a big problem with it. It's VERY slow. I mean slow as in: you move the mouse (at the menu screens), and wait ten seconds to see the pointer move. The audio loops like a drumbeat. It took several minutes just to position the mouse over "Play" and click it. I managed to get through to Start new game, and "Begin" and the init console eventually displayed, but a game never started.
It it just too old and junky of a machine? Or is the slowdown something fixable?
tnx
Doxy