FIXED WITH 1511. Hi, I'm having trouble to resolve an issue with a slow shutdown/restart. Just see my video, you will understand immediately : youtube.com/watch?v=Ni1-kY5vvSo On both : fresh install, no drivers installed, no software, local account, same bios settings. Drivers, tweaked bios / clear cmos, no USB connect, MS account, latest updates, latest insiders version, disable Win updates, disable Defender, and reg tweak changes nothing. I've also tested with Home, Pro, Enterprise LTSB. During the shutdown/restart, I see the HDD LED doing nothing 90% of the time. It does the same thing on a virtual machine with VMWare. As you can see, W8.1 work flawless. I do not count the number of fresh install i've done to try to resolve this.. Second issue with very slow logon : youtube.com/watch?v=xi6tYmdQpcw Drivers and software are installed, but even without them it can do that. Btw, it's pretty random, but when it's here, it won't get out. Hardware : 4770K, MSI Z87 GD67, 16GB DDR3, GTX 970, SSD M500 480GB, Rog Swift. Does anyone have encountered this issue ? It must be an hardware incompatibility (SSD, motherboard ?), I see nothing else (no problem with W7 or W8.1 ). Back to W8 for now..