Then comes the conversion. Ffmpeg has a wide variety of options that you can use to optimize your output. From resize, to modify the quality to even choose the format, the idea is to keep it simple and then make all the necessary modifications with GIMP.
Finally we can open out gif with GIMP (might take a while) and edit it. I just cut the window to dismiss the rest of the elements on my desktop, and then used the option Filters -> Animation -> Optimize (Difference) and simplified a nearly 3Mb gif to a 50k super smooth animation.
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