maybe offtopic, but one of the recent updates broke (some) botkiller weapons.
(i played someone @ MGE whose botkiller rocketlauncher dropped my fps by 150. not exaggerating there.)
edit: i don't know what speccy is, but you might want to check in your BIOS if it has set the mhz on your RAM correctly. mine actually hadn't done so, and i had to set it to the correct value in my BIOS. but just ignore this bit if you're sure that it's speccy's fault.
as for tf2commands; if you use one of chris' config, and you've read his comments, then i doubt that that's the problem.
have you recently installed a different GPU driver?