BOINC manager 7.6.22
Latest SETI@home I think. Version 8?

Enable processing and all 4 CPUs go to 100%. Other activities on the machine slow to a crawl. Suspend processing and immediate return to normal.

Suspending everything. If I can't find a solution, I'm uninstalling. I have work to do.

Regards,

Other activities on the machine slow to a crawl.

I never experienced this ("machine slow to a crawl") - as the CPU tasks/processes run an Low priority (as you can see by Windows Task Manager, Process Explorer, ...)

If I can't find a solution ...

Computing preferences

At "Computing" (top) section there are many "solutions", e.g.:
Use at most 50% of the CPUs
Suspend when computer is in use
...


P.S.
CPUs were always "maxed out" by default, this is not something new "after V8"

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- ALF - "Find out what you don't do well ..... then don't do it!" :)