Octave running slowly with KDE

Does anyone else have problems with Octave running excruciatingly slowly on KDE? It runs fine for me when I’m just using the command window, but if I need to save or open a file, opening the file dialog and loading the list of files takes about 2-3 minutes, and Octave is completely unresponsive while that’s happening. Just opening a new script took about 15-20 seconds when it should be on the order of milliseconds. I’ve experienced this across multiple computers.