Hello, this morning I came here just to write a report about okular taking 10 seconds to show printing mask, and I found this thread, so I don't feel alone anymore. All other software I print from doesn't show this annoying behaviour. Must be around one month I see this.
I also tried to purge and reinstall, but no change. Also the string to disable print discovery (bad, bad hack, btw) has no effect. In my opinion there must be some regression within okular code.