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You'd probably get the same if you wrote a slow paced, event based game in Flash. Dirty rects means that even though Flash rendering is called at x fps, it can

You'd probably get the same if you wrote a slow paced, event based game in Flash. Dirty rects means that even though Flash rendering is called at x fps, it can be skipped if nothing's changed (at least, as far as I understand it, my games always change each frame). Generally if a game has focus it should burn 100% CPU in order to update as smoothly as possible, but the real problem is games that still update and consume CPU like that when not in focus.

Hexstream 18y ago
But most of those games that burn 100% CPU still burn 100% CPU even if the game is paused with a static pause screen and the container window is scrolled past the flash area and the browser window doesn't have focus and is totally obscured. So it's obviously not a deliberate tradeoff.