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

Jiergir Ogoerg f35f22fan at gmail.com
Sun Aug 11 01:14:47 CEST 2013

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?

Using Ubuntu amd64 13.04, Intel Core i5, lots of ram. I used Qt 5.0 from
the Ubuntu repos and Qt 5.1 compiled from source on Ubuntu on same computer
- both show same result of about 220ms (warm), a cold execution on Qt5 is
even worse - 600-800ms.

PS: I resent this mail after subscription, sorry if it appears twice.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/development/attachments/20130811/fa2c3c16/attachment.html>

More information about the Development mailing list