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If old mobile browsers have 4MB caches, 160+k of that is a big chunk. If you could reduce it to e.g. 10k, you'd need 16 sites all using FA with different font selections before you equal the original size. There's a reasonable chance that it's an investigation worth doing.

Another option: find the most-used icons or combinations. Group them.

Another option: similar to nandhp, get a hash of the font selection and name the file so. There's a very good chance a nearby proxy has that combination stored already.

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