Not sure what materials your hoping for, but I've pointed codex at pprof application endpoints and just told it to identify hotspots and propose lowest hanging

Not sure what materials your hoping for, but I've pointed codex at pprof application endpoints and just told it to identify hotspots and propose lowest hanging fruit/highest ROI items to fix, which I then approved it to open PRs for. Reduced application CPU usage by ~30% on loaded servers. It's not magic. Fairly obvious oversights that I or someone else on the team could've found and fixed if we had looked, but it was never a business priority so we never did until I curiously spent 5 minutes asking it to do it for me.