Built a bit-exact performance fork of a 25-year-old C++ emulator with Claude: +61% faster, 3 days, and a correctness gate proving the output never changed
This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.
What it is: Snes9x-Z, a performance fork of Snes9x, the SNES emulator that ships inside RetroArch on millions of devices. It runs the same games with the same behavior, using substantially less CPU. Free to download and use, pre-built for Linux, Windows, Android and macOS, source included (non-comm…
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