JavaScript optimisation with LLMs is too good to ignore now

Using LLMs to optimize JavaScript performance has proven highly effective across 20+ real-world scenarios, reducing turnaround time from hours or days to minutes. The approach involves profiling with DevTools to identify bottlenecks, then having AI analyze and fix the code. Results include transforming a game from 20-30 FPS to near 60 FPS even with 4x CPU slowdown. LLMs successfully handled everything from simple closure optimizations to advanced techniques like baking tile maps into static textures and implementing complex bit-shifting algorithms. While some knowledge transfer is sacrificed, the speed and reliability of AI-driven solutions make them practical for shipping projects without accumulating technical debt.