You might already be aware, but I wanted to mention it for anyone else who might be interested in software performance - Casey has a new “performance-aware programming” course [0] where he goes through how to write performant software. It’s a work-in-progress where he’s putting out a video (or a few) each week. It’s pretty great so far. For anyone who’s done a CS degree it seems reminiscent of the architecture class where they taught about the CPU and assembly, except this is covering modern CPUs and SIMD and stuff, and focused on writing for maximum performance.
0: https://computerenhance.com