Comment by nrdvana

Maybe at rendering menus and documents, but flash had graphic routines written in optimized assembly that simply weren't possible with JavaScript on that era of hardware.

I feel like people are talking past each other a bit here. FlashScript was never very fast, and rendering a document as a giant collection of bezier curves was not fast, but the people doing animations with it were getting the equivalent of modern day CSS3 animations + SVG, and it ran nicely on hardware two orders of magnitude slower than what we need for CSS3+SVG