anyone tried using these yet? on an openSuse forum a poster claims much faster performance and the only issue as the panel is enlarged.

BUT I've experience a few issues:
plasma would only crash until I deleted the 2 plama rc files
knode crashes when attempting to respond to a post
at least 2 widgets crash plasma: toggle composite and quick launch
widgets are not sorted in the "add widget" dialog
Gmail in Konqueror won't login, login screen just keeps reloading

I probably should revert to the qt4.4 libs

I'm using Qt-4.5.0-beta1 with the latest svn. Everything is running fine so far except for Amarok. Latest SVN broke sound =[

Did you experience the performance gain that the opensuse user claims?

Damnshock wrote:Did you experience the performance gain that the opensuse user claims?

it's not real apparent to me, I don't run desktop effects and have a reasonably equipped pc (amd x2 3800+, 7300gt video card and 2gb ram) and didn't feel that qt4.4 was especially slow - at least for what I'm doing. Maybe the biggest gains experienced were with kwin effects, but apps do seem to be loading faster.

The openSuse forum poster claimed "The big change in Qt 4.5 is that Qt uses OpenGL instead of Xrender to render the GUI (which is around 5 times faster) ..."

Personally I'll probably be reverting because I'm experienceing a few bugs and will try again when the repo's are updated.

I just switched to QT4.5 this morning. First impression was bad as all I got in KDE4.2 was a black screen with a functional mouse pointer.

Some experimenting showed that I had to delete .kde4.2/share/config/plasma* (2 config files) and then I got a desktop again.

I was able to re-add all the plasmoids I use except quicklaunch.

As for performance: Yes it is noticably faster. I'm running effects on a pretty old system (Athlon64 3200, ATI X800XL). Everything has become much more responsive. I still have a slight delay when restoring a window and resizing windows is still horrible, but besides these old issues QT4.5 definetely made a nice improvement.

well I'm back to 4.5 'cause openSuse put the qt4.5beta in to the factory repo which is also the kde4.2 repo and I have 2 issues - 1) knode crashes when replying to a post and 2) kalarm crashes when executing a command alert but unlike above poster quick launch is working for me and I didn't have to remove and rebuild my pasma config (maybe because my distro has kde4 built with qt4.5?), there some known issues with Lancelot not displaying applications (resolved in trunk) and since I don't use effect i don't see the performance increase but I am getting window restore and resizing lags (which I don't recall having).

Just noticed that my idle CPU temp is down quite a bit too with QT4.5 (effects on).

I was using Qt4.5 for few days. Downgraded because Krusader 2.0 doesn't work with 4.5 and it is crucial for me. For the rest of KDE didn't noticed major breakups (krunner was crashing from time to time, irritating but not deal breaker). Everything was noticeably faster.

There were quite a few bugs found right after the rc1 release, so I woulnd't be surprised to see an rc2. The big improvements are lots of rendering optimizations. The biggest is with the raster engine (not opengl), but this will not be the default out of the box. Some distros may turn it on for KDE4 though. It's not going to be a silver bullet, however. If you have video problems now, 4.5 probably won't fix them.