SameGame QtQuick2 Demo App is Resource Hungry!?

[gemmell]

Or windows or compiling with MSVC.

[wysota]

No, I doubt that's the problem. Windows with MSVC is tier1 platform for Qt5. It has been heavily tested and I'm sure such erroneous behaviour would come out during tests.

[gemmell]

I asked a friend of mine to test it out, see if it was just me or my machine. Below are some emails I received:

Email1:
Well I manage to get 16.7% CPU which may mean its using a core and a bit or turbo boost is making the numbers weird and 6% - 20% GPU.

And even dragging the window round the screen seems jumpy. Does not seem good at all.
That's was vs2010. I have found that mingw does worse than visual studio in terms of perfomance and threads also don't seem to work correctly with mingw.

The specs for the computer are:
i7 2600k @ 4.85ghz
NVIDIA 570 gtx
Windows 8 pro 64 bit
Qt 5 64 bit dynamic


Email2:
I just built it at work using the qt5 from the commercial installer and it uses no CPU at all.

The only difference i can think of is that the installed version uses ANGLE.

Email3:
Just tried with vs2012 and its the same as 2010

[wysota]

The only difference i can think of is that the installed version uses ANGLE.

That would suggest problems with OpenGL drivers.

[gemmell]

Agreed that it sounds like OpenGL drivers, however the performance has been poor on every single computer I've tried it on (currently 4). The machine I'm currently on supports OpenGL 3.3 (according to OpenGl Extension Viewer) and has relatively recent drivers.

So the question needs to go out to a wider audience:
Has anyone built Qt for windows with -opengl Desktop and have samegame NOT consume ridiculous amounts of resources?