Why is Flash Player Slow while Playing Video

The flash elements like buttons, sliders and controls are designed in RGB color space, whereas the video is streamed in YUV. While presenting, the YUV video stream is converted to RGB and then combined with the RGB flash elements. This conversion is CPU intensive. The problem is magnified when you see the video in full screen mode.

You can avoid this problem by installing FlashVideoReplacer add-on on Firefox. This add-on will open the video with a standard multimedia player of your choice.

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