For those who use Kubuntu - at my case this bug is related with that one:
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/421067
In particular, say, etracer started from fluxbox shows fps ~2x faster rather started from KDE (it's a sin, but glxgears is also ~1.6x faster).
For those who use Kubuntu - at my case this bug is related with that one:
https:/ /bugs.launchpad .net/ubuntu/ +source/ mesa/+bug/ 421067
In particular, say, etracer started from fluxbox shows fps ~2x faster rather started from KDE (it's a sin, but glxgears is also ~1.6x faster).