I'm seeing something very similar.
Did a fresh install of 20.04 a week ago.
After being logged in half a day things really start slowing down.
Alt+Tab takes a few seconds to pop up, then you tab through to e.g. an
open Calculator instance and that takes 8 seconds to come to the
foreground. gnone-shell using 50% of one CPU.
Have tried your suggestions to no avail.
attaching the logs requested. journalctl shows a tone of javascript errors
e.g.
JS ERROR: TypeError: null has no properties
_onFocusChanged@resource:///org/gnome/shell/ui/closeDialog.js:135:9
$ sudo strace -c -p 7087
strace: Process 7087 attached
^Cstrace: Process 7087 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
34.73 0.215539 2 98592 sendmsg
23.99 0.148891 2 70929 36904 recvmsg
22.68 0.140739 2 68317 poll
16.42 0.101903 2 34030 writev
1.21 0.007527 4 1716 ioctl
0.46 0.002841 3 932 138 futex
0.25 0.001521 5 300 260 stat
0.10 0.000590 0 656 mprotect
0.06 0.000362 0 1165 write
0.04 0.000278 5 54 munmap
0.03 0.000205 0 305 getpid
0.01 0.000089 0 383 read
0.00 0.000022 1 13 timerfd_create
0.00 0.000017 1 13 close
0.00 0.000017 1 10 mmap
0.00 0.000017 1 13 timerfd_settime
0.00 0.000002 2 1 restart_syscall
0.00 0.000000 0 2 getrusage
------ ----------- ----------- --------- --------- ----------------
100.00 0.620560 277431 37302 total
Your journalctl command produced a 1.5Gb file. I have attached the last 100K
lines. Let me know if you need more.
** Attachment added: "journal-tail.txt"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1880723/+attachment/5393304/+files/journal-tail.txt
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https://bugs.launchpad.net/bugs/1880723
Title:
gnome-shell high CPU usage on Ubuntu 20.04
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