I played around for ages to get to this point with the Stealth II. It's a pretty nice card for the price (about $230) and has arguably better looking output than the Voodoo cards. Of course the Stealth is 2D/3D so it is far better value for money.
On my Pentium 200MMX with 32Mb SDRAM running at 512x384 and the Stealth overclocked to 60/120 MHz (engine/RAM speed) I get 28.4fps.
//GL Settings
set cl_blend "0"
set cl_particles "1"
set gl_mode "2"
set gl_driver "opengl32"
set gl_allow_software "1"
set gl_dynamic "0"
set gl_ext_pointparameters "0"
set gl_ext_swapinterval "1"
set gl_finish "0"
set gl_flashblend "0"
//set gl_flashblend "1" //glowing ball instead of dynamic lighting
set gl_keeptjunctions "0"
set gl_picmip "1"
set gl_playermip "2"
set gl_polyblend "0"
set gl_swapinterval "1"
set gl_ztrick "1"