I'm not sure if this is representative of fundsp as whole, or if there is some kind of issue with my OS config, but the keys example has an unusable amount of latency (probably like 200ms?) between key presses and notes sounding. The latency is present on both my MacBook and desktop Linux machine. I have already done some linux configuration for real-time audio that was good enough to eliminate most latency from VSTs running in Reaper.

Is this a known issue?

EDIT: See Resolution