[celsoazevedo]

Task Manager → "Start up" tab

Disable everything and see if it boots faster.

[kevinskii]

Thanks, that was the first thing I tried. I didn't want to go into great detail about my troubleshooting efforts because I don't think it's quite relevant to the overall discussion.

[_carbyau_]

To add further, those more adventurous can also use Sysinternals free Autoruns utility to find out everything that could start.

Handy hint, it has an option to hide all the default Microsoft stuff so you just see third party.