Here are the ones I did,but I didn't make a back up...
But before performing the tweaks it is better to take the back up of File first.
To take the back yu have to go to the default location of the file which is "C:\Program Files (x86)\Steam\steamapps\common\call of duty black ops\players\config_mp.cfg"
* Default: seta cg_blood "1" Change to seta cg_blood "0" (Blood Splatter will be turned off)
* Default: seta cg_brass "1" Change to seta cg_brass "0" (Turns off the empty shells of Guns)
* Default: seta cg_chatTime "0" (To disable chat in game) DO NOT DO THIS ONE...You will not be able to type in-game!!!!!
* Default: seta cg_drawFPS "Simple" (To keep track of FPS)
* Default: seta cg_fov_default "65" Change to seta cg_fov_default "80" (To get Wider view on screen)
* Default: seta cl_maxpackets "30" Change to seta cl_maxpackets "100" (To get more smooth gameplay)
* Default: seta drawLagometer "0" Change to seta drawLagometer "1" (To get Lagometer)
* Default: seta r_blur_allowed "1" Change to seta r_blur_allowed "0" (To avoid Blur on Zoom)
* Default: seta r_distortion "1" Change to seta r_distortion "0" (Removes heat and explosives distortions)
* Default: seta r_dof_enable "1" Change to seta r_dof_enable "0" (To remove depth of Field effect.)
* Default: seta r_gfxopt_dynamic_foliage "1" Change to seta r_gfxopt_dynamic_foliage "0" (To Off the Grass movement effect)
* Default: seta r_gfxopt_water_simulation "1" Change to seta r_gfxopt_water_simulation "1" (Turn Off Water animation)
* Default: seta r_glow_allowed "1" Change to seta r_glow_allowed "0" (Turn Off Glow)
* Default: seta r_multiGpu "1" Change to seta r_multiGpu "0" (Allow system to use only one core of Graphic Card)
* Default: seta r_multithreaded_device "0" Change to seta r_multithreaded_device "1" (Use only one Core)
* Default: seta r_specular "1" Change to seta r_specular "0" ( Removes Reflection)
* Default: seta r_texFilterMipMode "Force Bilinear" (To Fastest mipmode)
* Default: seta r_vsync "1" Change to seta r_vsync "0" (Turn Off Vertical Sync)
* Default: seta ragdoll_enable "1" Change to seta ragdoll_enable "0" (Turn Off body Falling)
* Default: seta rate "25000" (To get proper Rate)
* Default: seta sm_enable "1" Change to seta sm_enable "0" (Removes Shadows)
* Default: seta snaps "20" Change to seta snaps "30" (For Smooth play on server)