The following also applies to animated GIFs: Remember that the content should be optimised for mobile devices. Pay attention to a small file size and compressions if necessary.
We recommend for animated GIFs
a minimum resolution of 800x600 pixels
a maximum file size of 5 MB
Tips for reducing the file size:
Use only necessary frames
Reduce the resolution
Save GIFs with less detail (if necessary, use the Websnap setting)
Use tools to compress finished GIFs more strongly
This GIF with 20 frames and a resolution of 673 x 673 pixels has a file size of 4.7 MB and thus complies with the recommendations.