Unfortunately the problem here is not with Gimp, it's with GIF. GIF does not support partial transparency.
If you must use a GIF file then your only options are no drop shadows, or having a solid background behind the animation so partial transparency is not needed.
You could possibly use small dots instead of a gradient to get a less than perfect ...
Reposting (with permission) mathr's answer from Mastodon
Save the code below to script.sh
# 1. get input frame count (note two spaces after the "\")
count=$(gifsicle --info < input.gif | grep "<stdin>" | cut -d\ -f 3)
# 2. define how many times to repeat frames
# 3. construct new frame list
frames=$(for i in $(seq 0 $((...
So for anyone following behind me, I found the solution that worked for me.
The original format of the frames prior to trying to export as a GIF out of Gimp were PNGs that were placed in a tmp folder by Blender with the following setting as the output.
I then used the Optimize (for GIf) filter that Gimp offers and exported as a Gif with the following ...
Your frames are in "combine" mode, so the most likely explanation is that your GIF is "optimized": a frame only contains the pixels that are different from those in the previous frame, and everything else in the frame is transparent. You can restore complete frames (if fact you must, if you intend to edit anything) using Filters ➤ ...
You can do it, you have to merge every frame of the animation over as any copies of the still image. Pretty tedious but there are scripts that will do this for you, see for instance ofn-interleave-layers(you want the "single layer under stack" option, see the HTML doc included in the ZIP).
First and foremost, the speed a GIF plays at depends on your browser and hardware capabilities. Nothing to do with Photoshop really. If you set the frame speed faster than your browser can display it, then you simply won't notice that it's actually playing slower. You may have simply noticed this now because you have a new computer that has newer/better/...