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I'm interested in seeing some sort of solid documentation on the claims that flash has wildly better performance than JS. It kind of matches my experience with computers in the 90s and I'd really like to find out how much better it is, and why.

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Flash has a retained mode graphics API and a fantastic scan-line rasterizer. Each pixel is drawn once which is not the case for HTML Canvas where there is usually a lot of overdraw.

It's all about graphics perf, not AS3 vs JS anymore.

Could one somehow implement something similar on top of canvas, saving the renderer from doing all that extra work?

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