I came across some models that will increase your cs fps for sure,
they are UGLY to the max, but they do help
they are called boxhead and ballhead models and are designed to increase your fps ingame
first of all, backup your models folder in C:\Program Files/Valve/cstrike/models

then
go to
http://gamma.nic.fi/~amaki4/models/

and download any of the 2 model packs

extract the zip file, and replace your new folders with the old ones, make sure you have a backup so you don't have to download the original ones again (this takes forever)

go in your graphic card properties, turn off vertical sync, all the buffering, anti aliasing etc.
(for nvidia, turn slider to performance but keep vsync off in global settings)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
now, right click on your counter-strike shortcut / Properties / Shortcut / Target/
after "C:\Program Files\Valve\hl.exe" -nomaster -game cstrike

write this in, just copy paste this

-dxlevel 80 -heapsize 500000

this tells cs to use direct x level 8 for cs, u can use 90 as a value , or 91, 81 and so on
I wouldn't recommend using lower than 80 though

heapsize tells cs to use the amt of ram you set
I would recommend using this if you have low - medium amount of ram- like 512 mb to 2gb
the number tells it to use the mb

500000 = 500mb
100000 = 100 mb (not recommended to use this number)

keep this number about 70% of your total ram

k next, open up your config in cstrike folder and add these commands in there (this is from a site)

disable voicecomm (we got team-speak, ventrilo, why hear these 10 year old kids yelling?
voice_scale "0"
voice_enable "0"
voice_modenable "0"
sv_voiceenable "0"
voice_forcemicrecord "0"

disable EAX (gets more FPS)
s_eax "0"

disable A3D (not allowed in CPLS)
s_a3d "0"

sound delay (after you turned off Sound acceleration, or random sound delays)
_snd_mixahead "0" or "0.1"

Connection (Optimal Settings):

rate "25000"
cl_updaterate "100"
cl_cmdrate "100"
cl_lc "1"
cl_lw "1"
ex_interp "0.1"

if you have lags with the optimal settings try these values:
rate "7500-10000"
cl_updaterate "20"
cl_cmdrate "30"

1.6 graphic tweaks

NOTE: This setting will make your cs really ugly, but more performance !

gl_cull "1"
gl_keeptjunctions "0"
gl_texsort "0"
gl_palette_tex "1"
r_norefresh "0"
gl_round_down "3"
gl_picmip "2"
gl_playermip "2"
gl_ztrick "1"
gl_texturemode "GL_LINEAR_MIPMAP_NEAREST"
viewsize "120"
brightness "1"
gamma "3"
fastsprites "0"
fps_max "200"
max_shells "0"
cl_corpsestay "0"
max_smokepuffs "0"
mp_decals "0"
d_spriteskip "0"
cl_himodels "0"
model "gordon"
topcolor "30"
bottomcolor "6"
cl_minmodels "1"
cl_weather "0"
gl_affinemodels "1"
gl_alphamin "0.25"
gl_clear "0"
gl_dither "1"
gl_flipmatrix "0"
gl_flashblend "0"
gl_lightholes "0"
developer "1"
r_dynamic "0"
r_novis "0"
r_traceglow "1"
r_wateralpha "1"
r_mirroralpha "0"
r_bmodelhighfrac "5.0"
r_lightmap "0"
gl_max_size "128" (16/32/64/128/256) (less size less quality and more performance)
precache "1"

USB Mouse or PS/2 Mouse (if your mouse supports USB USE IT):

m_filter "0" for USB
m_filter "1" for PS/2

Zoom Sensitivity (fixed in 1.6, but you still can change it):

zoom_sensitivity_ratio "1-3" (I use 1.6)

disable ATI Truform:

ati_npatch "0"
ati_subdiv "0"

Enable MMX

r_mmx "1"

Right or Left Hand:

cl_righthand (1 is right hand, 0 is left hand)

Disable AutoWeaponSwitch:

_cl_autowepswitch "0"

Used to old cs versions? Want the old crosshair? This is for you:

cl_dynamiccrosshair "0"

Remove the lame new gui menus:

setinfo _vgui_menus "0"

Add these scripts to your autoexec.cfg or userconfig.cfg:

//Hand Switch Script
alias "LH" "echo - Left Hand Selected -; cl_righthand 0; bind h RH"
alias "RH" "echo - Right Hand Selected -; cl_righthand 1; bind h LH"

Sick of holding shift key to walk? Add this to your autoexec.cfg:

//Walk/Run Script
alias "walk" "echo - Walk Selected -; +speed; bind SHIFT run"
alias "run" "echo - Run Selected -; -speed; bind SHIFT walk"

Advanced Graphic Commands:

1 - enable
0 - disable

-Control the blood, disable it to get more performance. But who doesnt like blood?

violence_ablood
violence_hblood

-Control the gibs, disable to get more performance

violence_agibs
violence_hgibs

-Control the ATI Trufrom, disable to get a big fps improvement, enable for more quality

ati_npatch "0"
ati_subdiv "0"

-Disabling it will make the game render everything, even objects you dont see, only crazy people will disable it.

gl_cull

-Enabling this will make sure you wont see any crashes and/or 3d bugs, disable it for more FPS

gl_keeptjunctions

-Multi texturing, disable it only on old 3d cards

gl_texsort

-MMX, enable to improve performance

r_mmx

-Joystick, disable for more ram and to improve performance

joystick

-disable dither only if you have a really good computer, enable for more performance improvement

gl_dither

-Enable for more model quality, disable for more performance-

gl_smoothmodels

-Vsync, enable to limit the fps into your refresh rate, disable for highest fps

vid_wait

-Lightholes, disable for a little performance gain-

gl_lightholes

-Enable to see some objects like 1337 sunglasses and stuff like that, disable for more performance

r_mirroralpha

-Precaching, disable if you have 64mb or less, enable if you have 64mb or more, improves performance

precache

-Enable or disable the rain in aztec

cl_weather

-Loading only 2 models, SAS and 1337, enable for big performance gain, disable to see all the models

cl_minmodels

-Round down, set value from 0-4 , the lower the number the higher the quality, higher number equals more performance

gl_round_down

-Map quality, set value from 0-2, lower number equals more quality, higher number equals more performance

gl_picmip

-Player model quality, set value from 0-2, lower number equals more quality, higher number equals more performance

gl_playermip

-Texture size, values are: 16,32,64,128,256,512,1024 (default is 128), lower value means less quality and more performance

gl_max_size

hope this works for you guys, and gives you a big fps boost

to see your max fps , use developer 1 in your console

cl_showfps 1 or net_graph 3 show you your fps

That's all.