The Fastest GIF Does Not Exist
It seems the reason for pushing values like 10ms back up to 100ms originates from a requirement to emulate the slowness of Netscape. Qt and Firefox source code comments both want to reduce CPU usage but since a value of 20ms is supported, I think they should just be clamping the value to 20ms instead. Or, don’t clamp the value at all! Modern browsers already render 20ms GIF frames just fine, and I’m not sure the “computers are too slow” argument holds up 30 years later.