To update, this seems to happen much less frequently on dx9 (2-3 times per night compared with 10+ on dx8), and only starts happening after 1-2 hrs of gameplay. As a side note, mumble will also lag when this happens, though TF2 is the only game which causes this.
seven1PC Specs?
CPU temps/speeds?
temps around 60c in tf2
r5 3600
gtx1070ti
tf2 is on an m2 ssd along with steam and my OS (win10)
im using mastercomfig low