Comment 23 for bug 1642105

I've noticed an uptick in underflows with keylock on, even on my new laptop (i7-8550U) at ~10ms. Not a ton, mind you, just one or two per set, but that's up from never. Rubberband has always used a lot of CPU but it surprises me that every time I upgrade my laptop it's the same deep red in the cpu meter. (Can't we lazily precache rubber-banded track data at the current BPM instead of trying to do it on the fly?)

In the past I've been able to get by with 10ms and two tracks on keylock... I'm not sure if the move to qt5 has caused a perf regression in general that has pushed me over the edge.