If you have a bad/old computer you might have problems reaching fps levels like 125 fps or 250 fps, however if you use all of these commands you might have a small increase of fps
///

/r_drawsun 0 
/r_drawdecals 0 
/r_rendererPreference 0 
/r_aaAlpha 0 
/r_detail 0 
/r_picmip_manual 1
/r_picmip 3
/r_picmip_spec 3
/r_picmip_bump 3
/r_picmip_water 1
/r_distortion 0
/r_dlightlimit 0
/r_fastskin 1
/r_multigpu 1
/r_outdoor 1
/r_texfiltermipmode 3
/r_texfilteranisomax 1
/r_zfeather 0
/cg_brass 0
/cg_blood 0
/cg_marks_ents_player_only  1
/fx_marks 0
/fx_marks_smodels 0
/sm_enable 0
/r_lodscalerigid 4
/r_lodscaleskinned 4
/rate 25000
/snaps 30
/com_maxfps 125
/cl_maxpackets 100
/cl_packetdup 2
/com_maxframetime 100
/cg_fov 80
/r_gpuSync 3

And as last command:
/vid_restart


NOTE: Fullbright can also be used to help you reach higher FPS levels in non-punkbuster servers however, this may be considered as a cheat/hack and you may get banned from the server. Always ask an admin if it's allowed and use it on your own risk. This command is auto-detected by Punkbuster and you will receive a kick or ban:

Fullbright in non pb servers (cheat command):
/bind (key) "SelectStringTableEntryInDvar FPS FPS r_fullbright 1"
