Try looking through the console commands listed at:
There is also one PocketQuake specific console command called "r_maxparticles ###" where ### is replaced with the number of particles rendered during an explosion. Try setting this to 50 or below.
_snd_mixahead "0.15"
r_maxparticles "0"
d_mipcap "4" //sets a maximum quality for all textures
//set d_mipscale "4" //maximum scaled quality of distant textures
precache //loads sounds before map starts to eliminate ingame pauses
r_drawviewmodel "0"
r_maxsurfs "400" //limits rendered surfaces
r_maxedges "1600" //limits max edges, maxsurfs*4=maxedges
those settings should get you going pretty fast, although the screen will look like a muddy blur.
Change d_mipcap to an integer between 0 and 4, 0 being the best texture quality and 4 being the worst. That is the major command that will increase speed. R_maxsurfs and r_maxedges also help out a lot, but if you lower those too far then you'll get missing walls that turn grey. The minimum for those are 100 and 300 respectively. D_mipsscale makes textures far away low quality but textures very close high quality. If you use this command then set d_mipscap to a lower number, like 2 or even 0, or get rid of mipscap all together.
The autoexec.cfg file is the file that contains settings that are executed every time Quake runs. the Config.cfg file is the file that Quake creates on it's own with the settings that you set in the options menu and through the autoexec.cfg file.
