Default [Q] mk808b, slow startup

I just got my mk808b, which I am planning to use as a quick and portable media center. The problem is, that its extremely slow to start up. I timed it today and it took it 9 Min and 20 sec to show me the front page. Could the reason be, that I am using the usb port in my TV to power it. I only got an three pin power supply with, which I can't use because I live in Europe.

Any ideas?