Using Visual Tool on top of Presidio #246 I read on stdout "Glass vsync is 0" and get one more at every single action like opening a pull down menu.
It looks Mac specific, at least I don't see it on Windows.

Could have root cause here:
dhcp-grenoble-10-166-105-220:sdk yjoan$ sf "Glass vsync"
Binary file ./build/lib/desktop/libmat.jnilib matches
Binary file ./rt/bin/libmat.jnilib matches