Qt4 updated to 4.8.7: Slow text scrolling and higher load time.

System is fully upgraded, and i just noticed that every qt4 application has become incredibly slow when using QT_GRAPHICSSYSTEM=native (slow dolphin scrolling, slow konsole scrolling)
It is probably related to text antialiasing, because if i disable subpixel hinting in konsole, it start to scroll fast.
Reverting back to 4.8.6 fixes it.
I want to use native instead of raster because:
1) when used remotely via x2go and ssh, qt apps are very fast using QT_GRAPHICSSYSTEM=native
2) with QT_GRAPHICSSYSTEM=native one is able to retain RGB subpixel hinting even over trasparent windows.
I'm using nvidia-340xx 340.76 with a geforce 9800GT and freetype2-infinality 2.4.12-2 if it matters.
Anybody can help please?
-EDIT
This does not seem to be related to an update of the xorg-server, nor to the graphic driver; i notice the same behaviour when using a remote (fast) vnc connection.
I bet it is a QT4 bug; someone could test please?
Last edited by kokoko3k (2015-06-19 15:56:35)

It is not just the text scrolling under native graphicssystem to be slow.
All qt4 apps with text edit widgets are now slower to open, even with raster graphicssystem.
Gambas3 ide takes 6 seconds to start; on 4.8.6 it starts in 2 seconds here.
Just reported both:
https://bugreports.qt.io/browse/QTBUG-46700
https://bugreports.qt.io/browse/QTBUG-46778
Last edited by kokoko3k (2015-06-19 15:57:14)

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