[TheZenPsycho]

the format permits frames with 0ms delays. the problem is that there has never ever been a browser that respects the 0ms delay. On the whole, the status quo is that any delay under 10ms gets upgraded to 10ms.

Newer (current) browsers have lowered that to 6ms, and in chrome, 3ms. As yet, there has been no browser that respects the 0ms delay (as in, supposed to display instantaneously, so 2 frames with 0ms delay is supposed to look like 1 frame).

The justification for this is backwards compatibility with incorrectly authored gifs. So .. there you go.