Here is something I posted over at Boinc forums .
 
Ok when I move boinc manager any where Like to taskbar or to hidden icons and even over to second monitor or change it to simple view . It more or less down clocks from like 60% of the cpu to 20% the 60% is 12 of 20 cores . I only see it mostly on real long WUs . I really can not leave the app. open on my desktop its kind of in the way . I tried hiding it behind programs on off screen same thing it down clocks cpu .Some times restarting it will put it back like it should be crunching but a lot of times I do a repair on it . I only notice it on long WUs like Genefer 21 from PrimGrid .. I will have to check if some of the longer ones from yoyo@home that show 50 to 60 days down clock to But i think thats a bug think they are done or error out in a day or so . . Because if I restart the client there gone . Just checked can hide it on main monitor behind like this page and can have it on simple
 
Think I mite know whats going on
The operating system, with the help of Intel’s Thread Director technology, identifies the nature of each task and assigns it to the appropriate core type .This is from this article .

https://computercity.com/...essors/what-is-e-cores

So it looks like its both the CPU and win 11 not playing nice with Boinc WUs . But would be nice to find a fix because most intel's CPUs now have p-cores and E-cores . Looks like for some reason E-cores are getting assigned to the tasks when they should not . Way I think it should be is Boinc should use P-cores tell there all in uses then add E-cores . I have no idea how to make that happen its just my take on what I have found out . Not sure if changing some code in Boinc can fix it or if intel and Microsoft needs to fix it..
Edit
Found a work around not a fix . Need to run Boinc Manager in admin mode from this post .
https://learn.microsoft.c...h-intel?page=2#answers

I don’t have a CPU like that since I’m using x99 and x299 CPUs. Can you go to the Intel forums and ask them about it? Tell them just like you did here with the workaround. Maybe their help desk or whoever could take a look.
I have no idea what it would take
How about a program like affinity watcher and there are others that lock jobs to specific cores.
Can you just turn off the cores that don’t work well in the BIOS? I keep hyper thread off on my boxes most of the time unless doing sieve work

bill1024
Or just run it in admin mode 😂

 

bill1024
Can you just turn off the cores that don’t work well in the BIOS?

I think you can but Hyper treading is not what it once was , and E-cores let you do so much more then what you would think the would .I can game with all P-core and E-cores running WUs on top of folding on GPU with very little loss if any in FPS .

bill1024
How about a program like affinity watcher and there are others that lock jobs to specific cores.

I think they have tried them but not sure seems I read they did not work .