The OG XBox and even the One takes a while to boot from cold. Now that you mention it, the one issue I did have was that the 4TB external USB drive I had wouldn't sleep and kept trying to spin up. The solution was full shutdown and reboot everytime you used it. Moving to a 500GB SSD solved that problem and the 4TB is only plugged in to archive stuff. That's only on the OG XBox One, the One X only has an external 500GB SSD which has been enough for all the games I have played on it. Interesting issues with Forza. That's my jam and across all of them I've not had any issues at all including all the DLC parts (except one car which was invisible except the wheels ).