system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do gif files take so much longer to load than everything else on the internet?
gpt
A gif is a bunch of picture files that it shows in order, like a flip book.  So for a gif, imagine all those pictures stacked on top of each other.  It's a pretty big stack, right?  Your computer needs to download all those pictures - one for each frame of the gif.

A video doesn't take up as much file space.  Each frame of a video isn't a whole picture.  You start with a whole picture, and instead of having another whole picture for the next frame, the video file only keeps track of what has *changed* about the picture.  So moving from frame to frame, the video file only needs to store the information of what has changed from each frame to the next.  You don't need a stack of whole pictures, just a bunch of snippets of each one, so the file sizes aren't as big.