If your computer is taking too long to boot following your upgrade to Windows 10, you can fine tune the Advanced Boot Options to optimize the boot procedure. Following this process should speed up your computer's booting time.
How To Make Your Windows 10 PC Boot Faster
in the Search field > System Configuration. Then go to the Boot tab and click on the Advanced options button:
Tick the Number of processors and Maximum memory checkboxes and set their maximum values based on your current hardware configuration: