Claude-built Oblivion Remastered mod boosts FPS by over 40%

Reddit user LTSharpe used Claude Opus 5.5 over about 2.5 weeks to reverse-engineer and optimize The Elder Scrolls IV: Oblivion Remastered, releasing the open-source Performance Fix mod with ~40 engine-level changes. On a Ryzen 7 5800X and RX 9070 XT, average FPS rose from 72 to 102 (+41%) and 1% lows from 33 to 45.

• Average FPS in Imperial City rose from 72 to 102; 1% lows from 33 to 45
• In Cheydinhal FPS climbed from 64 to 91; 1% lows from 50 to 68
• Traversal hitches over 50 ms dropped from 19.5 to 4.8 per run
• The mod adds ML-based FSR Frame Generation support on RX 9000 GPUs