@Nupe2 V-sync is off by default. Did you maybe used to have it enabled, on 4.36?
On any mid-tier or higher system, it makes a huge difference – viz. pausing to wait for the monitor to flip frames, before turning the crank to draw and render the next frame.
(The trade-off is longer input-loop latency… eg. I find it noticeably harder to do AAR with v-sync on. )
Post your specs. We’ll happily opine on whether you need a $20 air cooler or a $200 liquid cooler or a $2000 new PC. 😛