Artifacts running konsole under Fedora-35

I've just upgraded from F34 to F35 and have troubles with KDE vs Wayland and X11.   Wayland is very flaky, crashes of various kinds, sometimes killing individual apps, sometimes an entire session.  I can't reproduce the crashes reliably; they happen when they happen. The only thing that may be relevant is that I am running Firefox with many (probably too many) windows and tabs. X11 messes up konsole, the KDE terminal emulator.  When typing onto the screen, not displaying text generated by an application, the test appears slowly and with many strange artifacts. It looks like the text appears on one interlace and then gradually gets better; the text takes about 500 msec to recover; the same thing happens with window decorations when I mouse over them. I have attempted to record screen behavior using simplescreenrecorder, but when I start it, the problem goes away. Right now I'm using X11 with gnome-terminal, which doesn't show the problem. System is: Operating System: Fedora Linux 35 KDE Plasma Version: 5.23.4 KDE Frameworks Version: 5.89.0 Qt Version: 5.15.2 Kernel Version: 5.15.12-200.fc35.x86_64 (64-bit) Graphics Platform: X11 Processors: 8 × Intel® Core™ i7-4790K CPU @ 4.00GHz Memory: 15.5 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 4600 -- All Suggestions Welcome - Jonathan Ryshpan <jonrysh(a)pacbell.net&gt; What is love? 'tis not hereafter; Present mirth hath present laughter. What's to come is still unsure: In delay there lies no plenty, Then come kiss me, sweet and twenty. Youth's a stuff will not endure." -- Shakespeare's Twelfth Night