OK, Installation was smooth. About dialog shows "VCL: kf6 (cairo+wayland)". I did some editing of documents (writer and calc), worked without a problem. Some notes: * In the overview of documents the name of the documents is only partially visible (see attachment) * The Plasma 6 feature that a scrollbar click takes you to the position in the document and not just a page down is not working. Would have expected that it behaves the same with the qt6 plugin. * The laggy interface problem is the same as with qt5. I guess I have to investigate some more... I'm going to do some more testing and will report issues. Thanks for your work!