Tried to run rolling quantile calcs across 200+ periods using [[NumPy]]. RAM exploded. System hung. Switched to [[CuPy]]. GPU took over. Now everything fits. Same code, just swap out the import. That’s it. Why I didn’t do this sooner, I don’t know. But now, anything that loops over windows gets ported immediately. [[CuPy]] [[NumPy]] [[Serendipity]]