Sprite optimization for animation

Greetings,

I wish to use a sprite sheet animation in my game's main menu to spice things up. I have already wrote the GIF player for that and I have rendered my image sequence at 24 fps. Upon import i turned off the Mip Map generation to cut back on file size. The images are small PNG-s with transparency (size: 655 X 655). Now each is 1.6 MB in size and I have 98 of them (that makes up a 4 seconds animation). As there will be hardly anything else in the scene I would like to ask if I should optimize something or will this be fit for a mobile game's main menu? Thanks in advance.

EDIT: I checked my profiler and the total memory used in the main menu (not just the textures) is 328 MB. Do you think that's too much for a mobile game?