Achieve <1 ms per page processing (On a 5.400 RPM hard disk)

[darccio]

This is a hard one but... It can be done. I want to do it. Zas can be faster!

This will need a big refactor of code and benchmarking every generation step. For instance, to reduce directory walking to one time instead of three (counting, generating, deleting).

A good milestone would be to get from 400 ms to less than 300 ms in my current test with https://github.com/pirata-cat/pirata.cat (200 pages, aprox).