Just for additional Explanation:
The filesize itself doesn't say anything, because it's compressed. If your image is 1280x768, you could calculate for example, that it would take approx 1280x768x4 Bytes of memory, which makes abot 4 MB per frame. If you now tell us, you have 23x8 frames, that single character eats up 4x23x8 MB of Memory, which are already 736 MB ....
So you HAVE to reduce the dimensions of your frames... Make it as small as possible, and crop as much transparency as possible....
Greets,
Spellbreaker.
Sorry!
width:1280
height:768
Mostly transparency provisionally
Very much thanx!