In case you’re wondering what the results might look like…
A little spoiler/teaser (nota bene, statistically unrepresentative):
GIF GIF89a, Subformat 7
Images in this category . . . . . . . . . . . . . . . . . : 1
Average color difference score . . . . . . . . . . . . . . : 0.00000E+00
Average duration GID [1] . . . . . . . . . . . . . . . . . : 0.683026139
Average duration ImageMagick (external call) . . . . . . . : 2.124468994
Average duration ImageMagick (as if internally called) [2] : 2.097257994
[1] vs. [2]: GID is 3.07054E+00 times faster