Comment 3 for bug 1718066

I also have the same problem, (not sure how related these are). Choppy equalizer performance, and weirdly, it works fine when not focused. (click on any other window and the waveforms normalize)

Mixxx version: 2.1-beta1 (2.1~beta1.20180219.46227dfcf-lp150.3.1) packaged with OpenSUSE Leap 15

I can only run mixxx with nvidia graphics,
optirun mixxx

regular invocation of mixxx fails with:
libEGL warning: DRI2: failed to authenticate

I was using Mixxx 2.2a earlier with old setup (nvidia+bumblebee) and didn't have the problem, think there is something related to Qt5 and graphics, though not sure where to look.