This is to let you know that it happens with any kind of mouse. My humble 5 bucks HP mouse does the same thing. Moving around ONLY the EXCEL window is SLOOOOW!
Indeed, I have Windows 10, Logitech wireless mouse. Same problem as everybody has described here.
All other windows drag easily, with no lag whatsoever. The mouse drag lag only happens in Excel and Word, I tested it in Powerpoint and it drags normal. Even turning off the 'Disable hardware graphics acceleration' in Excel won't fix the issue. It is some
weird setting, maybe a secret setting that we can't change or just a bug.
Microsoft has to change this because it's really annoying.