Here's 2 more links. I didn't see already posted worth watching/reading. Should give a good intro. Within 3 hours combined (For CPU performance anyway).

A good talk, doesn't go deep and instead goes a bit wide. https://www.youtube.com/watch?v=6RlloT_6WxA

This one explains the black magic the CPU makes have been doing. If you going to be optimizing code you should know your hardware. https://www.lighterra.com/papers/modernmicroprocessors/

Aditional note: I've noticed C++ conventions have a habit of having performance related talks, YT is your friend.