Qt performance

[yagabey]

Hello,
I've written a simple application for test purposes;but i've faced with a strange situation:

First; I've installed Qt from opensuse 10.3 dvd (qt 4.3.1), I've compiled my simple application. The result is fine...

Secondly; I've downloaded Qt 4.3.1 sources from trolltech's ftp site, i've compiled it(with default options); and then i've compiled the above application with that qt(the one compiled by myself).
The result is a mess....The application works at one tenth speed of the previous one...

And worst of all, I have to use the second method because of some technical reasons.
I am attaching my small application....

Does anybody have an idea about that situation; may it be a configuration related issue(if it is, what?).

Thanks in advance for your replies...