It's not something I'm super confident about and of course I don't want to scare users, but yes I already decided that there will be switch to mBTC as default on bitcoinity (with option in preferences to switch back to BTC). It should happen pretty soon.

Regarding slowness, I already did throw some more hardware at it and it should be better (is it?), other than that I still have some optimizations left but I need to change architecture a bit because 1Gbit/s turns out to be a bottleneck at certain points.

Also it's kinda hard to focus on coding and doing useful stuff having these bitcoinity charts opened..