FontSystem::new() takes a significant amount of time

[notgull]

On my system (Xubuntu), running FontSystem::new() takes a significant amount of time. On release, it takes around a second to run. On debug, it takes up to ten seconds.

There should probably be some measures taken to make sure FontSystem runs quickly. However, it should also be noted somewhere that FontSystem takes a while to load.

[jackpot51]

The major time is due to mapping every font, I believe. Lazy mapping would help a lot.

[notgull]

If the fonts aren't already in hot memory that can take a while as well. I just recorded system font loading taking 30 seconds on debug mode.

[soloturn]

is this the same as pop-os/cosmic-edit#3 ?

[jackpot51]

Lazy mapping is merged, please see if this is fixed

[notgull]

Looks good to me from a glance, I'll post more in-depth statistics later