I tried manipulating small datasets (overclocking results by CPU), under 500 rows, and the performance was abysmal. Maybe not performance, but responsiveness ?

I tried manipulating small datasets (overclocking results by CPU), under 500 rows, and the performance was abysmal. Maybe not performance, but responsiveness ? The UI was lagging. It was in Firefox, a few years ago, and I never went back to it. MS Office 2010 is much snappier.