Change how fast a GIF plays. We rewrite only the timing, so the picture stays exactly as it was.
Drop in an animated GIF. We read its frame timings.
Choose a multiplier, or set every frame to the same delay.
Only the timing bytes change, so there’s no quality loss at all.
Good to know. Browsers won’t show a GIF frame for less than 20 milliseconds, and treat anything shorter as 100. So a GIF that’s already fast can only go so much faster. To go faster still, drop frames with the GIF optimiser.
No. We change only the delay values stored in the file. The frames themselves aren’t touched.
Each GIF frame needs at least 20 milliseconds on screen, which is 50 frames per second. Below that, browsers slow it down instead.
No. The size stays the same, give or take a byte.
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