Yes, you have to keep a keen lookout for those particular updates ,crafty, recommended for windows 7.
I had a dual boot and there was no way at the time that I wanted two windows 10, it's certainly not a fair way saying they are for windows 7.
I was forever checking my hubby's machine and...
That's weird behavior, I recently had a similar setup win 10 home and win 7pro.
I never experienced anything like that all my cores and threads were working on both OS.
I got most games and software to work in 10 so am just using 10 now.
In your task Manager in 10 does it just show...