Slow bootup black screen for minutes

Hi there, i have an Asus Zenbook with an I5 processor and 6gb ram that came with win8.
I have upgraded to Win10 and now it boots very slow, it takes a few minutes now to get to the asus logo and then it goes in to win 10 login. I thought the old hdd was the problem so i bought a new WD ssd but it is still slow at bootup. I have disabled fastboot and updated the system with latest Intel drivers and run all win10 updates. If i do a reboot it is much faster, if i shut down the system and power on again it is still slow. Any ideas?

Welcome to the forum. Open task manager goto startup it list what is running at start and tells you the impact on boot time post screenshot

Post a screen shot from disk manager showing all the details

https://i.imgur.com/vUJ7ses.jpg

Whats the second disk showing as not iinitialised that would hold the bios ais it trys to work ou what it is

Why does the efi partition show as empty?

Hmm, i dont know. I did a clean install of win10 on a new ssd drive. Downloaded the iso directly from windows and ran the install from usb drive using their tool. I only have the one disk, the laptop has an mmc sdcard reader, might be this showing up as a disk? (Card slot is emty).

Try booting win10 install then choose auto repair see if that fixes it there are couple of ways of doing it How to repair the EFI bootloader on a GPT HDD for Windows 7, 8, 8.1 and 10 on your Dell PC | Dell US

There is a good video on fixing Windows 10 - Repair EFI Partition - YouTube

Compare the boot to clean boot:
Perform a Clean Boot in Windows 10 to Troubleshoot Software Conflicts | Tutorials

When you replaced the HD with a SSD did you restore an image or did you clean install Windows?