[Development] QApplication startup is a lot slower in Qt5 than Qt4

Jiergir Ogoerg f35f22fan at gmail.com
Sun Aug 11 06:40:07 CEST 2013

Thanks, I compiled and installed from
did a reboot and tested again, I didn't notice any difference, I get about
190-220ms on Qt 5.1.1rc1 (while qt4 takes less than 100ms).

I wonder if I picked the wrong source files or if the startup time is gonna
further improve.

On Sun, Aug 11, 2013 at 3:55 AM, Thiago Macieira
<thiago.macieira at intel.com>wrote:

> On domingo, 11 de agosto de 2013 02:14:47, Jiergir Ogoerg wrote:
> > Did anyone notice that
> > QApplication app(argc, argv)
> > takes on Qt5 about 220ms (warm execution) to execute while on Qt4 only
> > about 50-75ms (warm execution)?
> > Another person confirmed these results on his computer.
> >
> > Can anyone please explain why it happens and if/when it gets fixed?
> There have been a few fixes post 5.1.0 to fix that. Please make sure you're
> using 5.1.1 (release branch) or 5.1.2 (stable branch).
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
> _______________________________________________
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> Development at qt-project.org
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