I still like to be persistent in thinking that the too low SFS is the real cause. Of course it is the combination, but when I set my SFS to 0.8 or lower, I can bearly "pull" the OSD screen (which comprises of Coverart, OSD Text and XXOSK).
And true, without the 1/1/1 setting you mention, it will be less of a problem (or none - I did not test).
This *IS* W10 related; so what's flawlessly in W8 (since 2.xx) is difficult in W10 for sure.
In the end we can expect that the Processor Core Appointment setting is related *and* that it is processor related. Processor speed can be related, but I don't think it really is.
Also let's keep in mind that when things are really critical, a reboot is a first thing to help. So don't fall in that pitpall, because it's not the intention to reboot each hour (you are allowed to of course, but ...).
If you like, try a few things and let me know. But don't do it for me (and notice that personal me wouldn't go without the 1/1/1).