I have a Win7 machine at home office but had to buy a new laptop for my new office. It came with Win10. It runs about 1/2 the speed of the Win7 box, even though it has twice the cores & twice the RAM, and that is even after I spent 3 hours removing the bloat-ware. For example, Win10 comes with a non-removable app called XBox. Who needs XBox on an office machine? Why is it non-removable? I give it about another week before I take it in and have Win7 installed.
I haven't noticed any change in speed of this PC.