Wow, just WOW! I am making a game with full-screen stop-motion (Kind of like FNAF 4, but it's not a fan-game so GET THAT CLICKTEAM GUILLOTINE AWAY FROM ME)
And the active running the animation (150-300 frames) decides "This would be a 30 MB GIF, let's add 100 MB to the .MFA!" Another thing about it too is that this is taking 1 GB of RAM to run these animations.
I am not asking for a solution (though that would be cool, as the only idea I have is compression) but I am simply asking for an explanation for why the engine is wanting to make images larger.
PS - Here is a 60 MB GIF, it is around 120 MB according to CTF2.5