QApplication init very slow

[huajin]

my software startup is very slow, and i found QApplication init is very slow.
how can i upgrade the startup speed??

[sierdzio]

Make sure you are using newest Qt version available. QApplication init was slow in Qt 5.0 and Qt 5.1, it has been fixed in Qt 5.2.

[huajin]

yes, i am ture it is qt5.2 + mingw32, but my software run in CD. when the cd put into computer, statup my software first, it is very slow, about 1-2 m. next times it is very quickly about 1-2 sec. i donot know how to do??can you help me

[huajin]

i am waiting online. it is very important for me.
[quote author="sierdzio" date="1390742972"]Make sure you are using newest Qt version available. QApplication init was slow in Qt 5.0 and Qt 5.1, it has been fixed in Qt 5.2.[/quote]

[sierdzio]

Your OS needs do load the DLLs before it can start the application, I suspect that is the problem. There is little you can do about it, apart from maybe using a faster CD drive.

I might be wrong, though, there may be some nice solution waiting for you. I just don't know it :)

[JKSH]

Hi,

Here is a way to check if your CD player is the problem: Copy everything from your CD into a folder on your desktop. Run your program from this folder.

Is it much faster than running from the CD?

[huajin]

i have tried.

Run my program on desktop, it is very fast....

i write a test program, just only display a button, copy it to CD and run it, it also very slow.

so i think QApplication init is result.

Test program like this:

QApplication a(argv, argc);
QPushButton btn("test");
btn.show();
a.exec();

[quote author="JKSH" date="1390835206"]Hi,

Here is a way to check if your CD player is the problem: Copy everything from your CD into a folder on your desktop. Run your program from this folder.

Is it much faster than running from the CD?[/quote]

[JKSH]

[quote author="huajin" date="1390835541"]Run my program on desktop, it is very fast....

i write a test program, just only display a button, copy it to CD and run it, it also very slow.[/quote]Then QApplication init is fast, but your CD drive is slow.

[huajin]

my CD drive is fast.

i copy some VB and MFC program to CD and run it, it very fast...

[quote author="JKSH" date="1390835838"][quote author="huajin" date="1390835541"]Run my program on desktop, it is very fast....

i write a test program, just only display a button, copy it to CD and run it, it also very slow.[/quote]Then QApplication init is fast, but your CD drive is slow.[/quote]