Hello, I know to program with Qt, and I like the way it is designed.
but I prefer Gnome, my question is - will there be any performance penalty for using Qt apps under Gnome?
(apart from the need to install the Qt runtime, and the fact that the looks might be different).

is there anything i can do with Gtk that i can't do with Qt because my program operates under Gnome?

Hi.

Yes, there will be a performance hit - startup time may be increased in a GTK environment, as a QT app will have to load the QT libs into memory, whereas most of the GTK libs will already be loaded for a GTK app. There will be more total memory used in a GTK + QT situation for the same reason.

"is there anything i can do with Gtk that i can't do with Qt because my program operates under Gnome?"
Probably not. Unless you're relying on KDE environment stuff like arts you should be fine, and even then it shouldn't be an insurmountable problem.

Plenty of people run Gnome but use, for example, k3b for burning CDs, and don't have any issues. I wouldn't worry about it.

Dave

Many Gnome users object to running KDE applications because they tend to start up a bunch of KDE daemon processes which hog memory and CPU cycles. QT apps don't have to use the KDE libraries of course, so if you intend to appeal to gnome users avoid using KDE libraries.

Thank you both, you have been very useful.

As long as the loading time and memory footprint overhead aren't that bad, I still prefer Qt.
(it's like preferring C++ over C, I get some overhead, but it's worth it as long as it's not runtime critical application.)
if I wanted to take it to extreme i could have use pyQt (which is even more fun to program, but even less efficient).