Lads if you are really in need to get more fps , even if the quality of the texture becomes really baaaaaad
try this commands
gl_max_size 16 or 32 => this will turn your texture dramatically bad and it will be blurry
EDIT : AND FOR THE LOVE OF GOD , do not always set your fps to 100 , only set it to 100 if your PC is ABLE to generate 100 fps , lock it to 60-70 if your pc is bad then always do cl_cmdrate +5 above from your fps like cl_cmdrate 65-75-80 in this case
+ I saw in servers that sv_maxupdaterate is 30 , so that's why I get a lot of choke when setting cl_updaterate to 101-100-90 , so maybe if you set it to 30 you will get far less choke thus less lag , this is just a theory though !