My BOINC is configured to pause when I use the computer (Raspberry Pi 4 B 8 GB with Raspbian Buster 32-bit), and that works, but some other BOINC-processes runs instead at almost 100%:
16290 boinc 39 19 103M 18860 5792 R 98.9 0.2 20:50.16 cmdock -c -r target.prm -p /var/lib/boinc-client/slots/2/data/sc
16288 boinc 39 19 104M 18888 5852 R 98.2 0.2 20:55.59 cmdock -c -r target.prm -p /var/lib/boinc-client/slots/3/data/sc
16286 boinc 39 19 163M 79816 5792 R 97.6 1.0 20:45.58 cmdock -c -r target.prm -p /var/lib/boinc-client/slots/0/data/sc

I copied the above from htop.

In BOINCTUI it looks like this:
1 Susp. 64,11 SiDock@home 4h 4d CurieMarieDock on BOINC + zipp corona_NSP14_MTase_
2 Susp. 47,41 SiDock@home 35m 4d CurieMarieDock on BOINC + zipp corona_PLpro_v3_sid
3 Susp. 41,85 SiDock@home 39m 4d CurieMarieDock on BOINC + zipp corona_PLpro_v3_sid
4 Run 98,41 WUProp@Home 27s 6d Data collect version 4 data_collect_v4_164
5 Wait - SiDock@home 67m 4d CurieMarieDock on BOINC + zipp corona_PLpro_v3_sid
6 Wait - SiDock@home 67m 4d CurieMarieDock on BOINC + zipp corona_PLpro_v3_sid
7 Wait - SiDock@home 67m 4d CurieMarieDock on BOINC + zipp corona_PLpro_v3_sid

The computer is super slow to use. The only workaround I found is to reboot. Then it works normally for some time e.g. some days, but then this problem starts again. What is "cmdock -c -r target.prm"?

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Hello mobluse!

Yes, it's a known issue. You can try to restart the BOINC service also.
cmdock is executable which performs main computations.

Thank you for attention and participation!