🚀 go-pugleaf

Gif animations were never meant for that kind of frame rate. You've got a total of 105 gifs in your 15 fps animation and 140 gifs in your 20 fps animation. An animated gif is just a bunch of gif's stacked on top of each other. I don't think the file size is at all inappropriate for 105 gif's that are 320 X 120. 320X120=38,400 pixels that's 38thousand pixels times 105, for a total of 4,032,000 which you have to multiply by 3 for RGB, or roughly 12MB uncompressed. You're getting 12MB compressed into 200 KB.   

If you want to run a 7 second animation of this size at 15 or 20 FPS you'd have much better luck with Quick Time.  

Again, very few gif animations are more than 10 frames. If you changed the frame rate so your animation only contained 10 frames then your file size would be about 20 KB, and that would be reasonable.