Suggestion for next CIQ release : Filter system fonts

The filter is applied to user defined fonts to reduce the size of the generated font map. The system fonts are already compiled into the system software, so we can't filter them; it's too late. I'd have to double-check, but I'm fairly certain that the system fonts do not affect application memory usage, so I'm not sure what benefit you'd expect to see by filtering them.

Travis is correct. System fonts are part of the device firmware and have no impact on Connect IQ application memory.

I would have thought loading less system fonts would make more memory available for datafields/applications. Even if system fonts are part of the device firmware, isn't it a way to not load them into memory?

Nope.  they are already in memory as they are part of the firmware.  That's why you don't have to do a loadResources() on them as you do with custom fonts.

The main system firmware is not running within the Connect IQ framework, and nothing that it does with its memory will impact a Connect IQ application. The application is given its own segregated memory pool to run in, and these are statically sized based on application type for each device. The system fonts exist outside of the Connect IQ memory pool and cannot have an impact on the space available for an application. 

Thanks to all of you for the quick responses!

One other thing to note is if there was a way to do this, you'd need a different filter for many of the supported languages, as FOMAT_MEDIUM and FORMAT_LONG for Time.Gregorian.info() returns things in the current language on the watch, even if you use english for everything else.