Hi there,
after further testing I'm not sure if its only an graphic issue. Because
a basic QWidget / QPainter test application did not show any slow down
with Qt 5.5.1. So it might be a deeper issue.
All I can say is that my application runs 30% slower with QT 5.5.1 than
with Qt 5.5.0.
So I downloaded both Qt versions again and made a clean install. And
after recompiling the Qt 5.5.0 and Qt 5.5.1 versions of my application
both ran slow !
So I checked the files from the new downloaded Qt 5.5.0 an saw that
there are new files in it: For instance Qt5Core.dll and Qt5Cored.dll are
from 23 October 2015 !
So I went back to the initial QT 5.5.0 release with Qt5Core.dll and
Qt5Cored.dll from date 11. August 2015. And the speed was there again !
There is definitely something wrong with the new Qt 5.5.1 release. But
I'm not an Qt expert to find out which Qt module does the slow down.
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