Facebook snapshot:

- minified, decompressed: 42Mb;
- minifed, brotli-compressed (max compression): 9Mb;
- entropy
  - non-optimized dictionary, decompressed: 13Mb;
  - non-optimized dictionary, compressed with brotli: 1.9Mb;
  - minified, entropy-compressed: 6.9Mb

Two notes about the non-optimized dictionary:
- it contains lots of useless data, we should be able to reduce it a lot;
- the same dictionary should work across many releases of Facebook.