[Development] High CPU with QToolBar win32

[Milian Wolff]

On Friday, May 20, 2016 12:20:47 PM CEST Tres Finocchiaro wrote:
> Hi,
> 
> Are there any known issues with QToolBar Qt5 win32?
> 
> We've (LMMS) a downstream bug and I'm trying to isolate the cause.
> 
> https://github.com/LMMS/lmms/issues/2767
> 
> 
>    - It only happens with Qt5
>    - It only happens with QToolBar
>       - We have the QToolBar in a QMdiSubwindow/QWidget, not the main
>       window.
>    - It's not reproducible with QtCreator, at least when using the default
>    UI creator and the main window's toolbar.
>    - We use a win32 build of Qt5 from a self-maintained PPA, so if a
>    particular issue was addressed upstream we may not have it yet, but I
>    couldn't find a particular bug that mentioned this.
> 
> Disclaimer, slight amateur debugging these things. :)

If this is a performance issue, then please use a profiler to figure out where 
time is being spent. Visual Studio nowadays has a simple but usable sampling 
profiler built-in.

Cheers

-- 
Milian Wolff | milian.wolff at kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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