the only real way to tweak q3 properly is to edit the config.cfg or to add a new file in the "baseq3" folder called "autoexec.cfg" and put in the commands you choose to change in there. it will always load the game with those settings, so in the event of having to format, just back the "autoexec.cfg" file up and stick it back after reinstall and everything will be as was pre-format 🙂
I recommend trying these commands though
/s_khz "11"
/snd_restart
/com_blood "0"
/cg_gibs "0"
/cg_marks "0"
/r_subdivisions "100"
you lose some of the detailing... less quality sound (increases fps), no blood, no gibs when the bodies splat, no marks on the wall when u hit it and the curved walls arent as curved (saves a few fps also)
edit:
pm me and ill send you an autoexec.cfg which has good settings for that intel card already set up (my gf used to have intel onboard originally - so im sure ive got her old config somewhere 🙂)