[vtkusers] Advice on mitigating choppy resize with Qt 5 + VTK 7.1

[Elvis Stansvik]

Hi all,

I'm using Qt 5.5.1 and VTK 7.1. The program has a couple of VTKWidget
showing volume renderings, as well as a window with a chart.

Have a look at the attached screen recording. Notice how camera
interaction in both VTK render windows is nice and smooth, but when
resizing the windows, the updating of the renderings is very
slow/choppy.

I've been trying to debug this, or at least finding a way of
mitigating it. Could it be that Qt is delivering too many resize
events? Has anyone else dealt with this problem?

Thanks in advance for any advice,
Elvis
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