CharisSIL is a large font because of how many extended characters is contains. Most of that is unused. So when you subset, you get rid of the fonts not used and the characters not used. Most of the time, you will get rid of the bold italic version of a font. You can cut down the size of CharisSIL (on average) to between 200-300K verses about 1.2-1.3MB per font file.
As for the large graphics, this is because people read tablets with high resolution screens and tiny 800x600 sized graphics just don't cut it all that well.
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