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

[Jiergir Ogoerg]

Thanks, I installed both binary and from source qt 5.1.1 that was announced
half a day ago on this mailing list and get same results: qt4 "QApplication
app(argc, argv)" executes 2-3 times faster on same computer than Qt5.

What are _your_ numbers on this issue and what OS are you using if not a
secret? I'm asking because maybe it's an Ubuntu issue, I used Ubuntu amd64
13.04 and 13.10 daily.


On Mon, Aug 12, 2013 at 10:55 AM, Rutledge Shawn
<Shawn.Rutledge at digia.com>wrote:

>
> On 11 Aug 2013, at 6:40 AM, Jiergir Ogoerg wrote:
>
> > Thanks, I compiled and installed from
> >
> http://download.qt-project.org/snapshots/qt/5.1/5.1.1-rc1/backups/2013-08-10-96/single/
> > 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.
>
> https://codereview.qt-project.org/#change,60247 should have made a
> difference, but was already merged to stable branch.
>
> You can try this patch
>
> https://codereview.qt-project.org/#change,60248
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