I wouldn't worry about it. 1-3 min from shut off to desktop is probably the norm. I do wonder what Win 10 is doing with a 30 sec black screen.
Does anyone know how to trace the boot process in Windows 10? Windows 7 and 8 had xbootmgr, but there doesn't appear to be Windows 10 version. All I've managed to find so far is the boot log which is not very helpful. The only things which are weird about it are that it tries to load certain drivers multiple times and only succeeds the first time. That is:
BOOTLOG_NOT_LOADED \SystemRoot\System32\drivers\dxgkrnl.sys (5 times)
BOOTLOG_NOT_LOADED \SystemRoot\system32\drivers\WdFilter.sys (only 1 time)
The Event Viewer isn't very helpful either (or maybe I don't know exactly how to look).
Instead of restarting... I just opt to shutdown and then hit the power button again
You might notice that, if you go to Task Manager, the System Up Time would not be reset when you use fast shutdown.
for me it's better without fast start time
I have done several clean re-install of Windows 10 on the same PC.
Before doing the clean install, I deleted all partitions on the HDD - except for the UEFI partition.
After that, I installed drivers / programs one by one, restarting twice after each, using a stopwatch for timing. Also, I ensured that the PC is not connected to the Internet, otherwise Windows will automatically download drivers for Graphics, Touchpad etc that are not necessary the most up to date.
From the time the OEM logo appears till it disappears, it always takes about 10 - 15 seconds.
The time right after the OEM disappears till the Login screen appears:
Clean install, without installing any drivers / programs: 20 sec
Installed several drivers incl Intel Chipset, HD Graphics etc: 20 sec
Installed Intel Rapid Storage Technology Driver: 40 sec.
Uninstalled the Intel Rapid Storage driver, did a cleanup, but the start up time did not return back to 20 sec.
At this stage, I resorted to another clean install. This time, decided not to install the Intel RST driver.
Installed several more drivers: 20 sec
Installed Adobe Acrobat Reader DC: 40 sec
Installed avast anti-virus: 40 sec
Installed several more programs, incl Google Chrome etc: 40 sec
Installed Comodo Firewall: 1min 10 sec
Installed MS Office: 1min 10 sec.
Basing on the above, quite obvious some programs are causing problems.
FYI, all drivers are downloaded straight from the respective official sites to make sure they are most up to date.
When it is showing the black screen, is there any hard drive activity? My antivirus supposedly adapts to my PC as I use it, so after installing it, my computer's boot process was sluggish for a while but eventually it began booting in less than 3 seconds.