So I took some measurements with my corpus and here are the results for savings:

|                             | with archive  | without archive | savings |
|-----------------------------|---------------|-----------------|---------|
| Raw (en-US, firefox-os)     | 357036 bytes  | 355858 bytes    | 0.33%   |
| gzipped (en-US, firefox-os) | 69876 bytes   | 69804 bytes     | 0.10%   |
| Raw (en-US, firefox)        | 2480317 bytes | 2475947 bytes   | 0.18%   |
| gzipped (en-US, firefox)    | 438037 bytes  | 437905 bytes    | 0.03%   |

So it doesn't look like it matters that much, but i feel like we should still optimize where possible. No?