Now it works fine, after a reboot and with 200% scaling on. Next, I disabled the version of this extension packaged with Ubuntu 20.04, and replaced it with the one from the GNOME Extensions website. It's only after I enabled 200% scaling that they went hairy, even after a reboot. I switched back to the 4K monitor, set the resolution to 3840*2160 and scaling to 100% (so, no scaling) and things remained normally smooth. So, with this single extension on, I plugged my old monitor back (with the new one off) and then Appindicator behaved well. Necessary and sufficient condition, one might say. What is more, enabling Appindicator alone (with no other extension on) did cause the issue. I re-enabled extensions one by one and came to the conclusion that my usual batch caused no problem, but for Ubuntu Appindicator. Everything is equally smooth on Windows 10 or KDE by the way, so it's not a hardware problem. Indeed, with a naked vanilla GNOME everything is smooth, as it should be. I investigated the matter and unmasked a very unexpected perpetrator: this extension. And, indeed, sysprof told me that gnome-shell was responsible for about 90% of CPU load over a couple minutes of everyday tasks, whereas in normal times it's about 5%. I could even hear abnormal fan noise, signalling that my CPU was struggling. ![]() ![]() ![]() And then my desktop's performance took a dramatic hit, with regular stutters making even basic web-browsing and emailing a chore, with only a small amount of active windows or tabs. I set resolution to 3840*2160 with 200% scaling (not just font scaling full scaling). I've just replaced my old monitor with a 28" 4K one.
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