[Development] OpenGL sluggishness on Qt5 vs Qt4

Dov Grobgeld dov.grobgeld at gmail.com
Thu Nov 20 11:25:38 CET 2014

I created a small (but perhaps not small enough?) example to illustrate the

See: https://github.com/dov/QtGLProb

Please test it under the following conditions to see the problem:

1. "qmake-qt4; make; ./debug/ModelViewer"
2. "make clean; qmake-qt5; make; ./debug/ModelViewer"
3. "env vblank_mode=0 ./debug/ModelViewer"

Case 3 eliminates the problem for small window sizes, but when enlarging
the window to the full screen, the same lagging behaviour as in case 2 is


On Thu, Nov 20, 2014 at 10:37 AM, R. Reucher <rene.reucher at batcom-it.net>

>  On Thursday 20 November 2014 10:13:26 Dov Grobgeld wrote:
> > Will it help if I create a minimum program reproducing the problem?
> I can't comment on your actual problem, but yes, this is definitely the
> way to go...
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