I'm been running all builds of Windows 10 on a 1TB Western Digital Green Caviar drive which is not particularly fast, but after last nights upgrade from 10158 to 10166, it appears a lot slower.
7 Secs from the BIOS screen to Windows 10 logo
15 Secs from Windows 10 logo to black screen
63 Secs from black screen to Log-In screen
77 Secs from Log-In to Windows 10 Start Screen
making this 140 Secs before Log-In is complete.
Anyone else found start up time getting longer or is just me!