Having too many programs or apps opening automatically when you first boot up your computer can cause slowdown. This is easy to fix in Windows 10
How to disable Windows 10 startup items
Type startup in the Windows 10 search box then select See which processes open automatically when you start Windows. This should be the top result.
You should now see a list of startup items and an estimate of their impact on your boot speeds. You can right-click and Disable any that you feel are non-essential.
If you're unsure about which programs to disable, it's worth searching for any additional information online first. Security software is essential - always let this run from startup.