I still have the default Windows install but removed some of the Lenovo tool/software that I don't use. My install currently has around 70 processes running at startup. Boots up quick, resumes from hibernate quickly (I never shutdown, just hibernate now) and is responsive in Windows.
You need to give Windows a few days as it'll spend the first days indexing, etc.
I wasn't asking because I wanted to reinstall windows. I needed to because I've fitted my SSD.
I'll give it a go anyway and report back.