My Galaxy Tab booting:
As you can see, it takes 38s to boot up vs 50s of the Nook Color. The showed Galaxy Tab has a problem for sure or, that video has been altered (by omission or on purpose)
Another thing is, the browser's speed on Galaxy Tab is extremely fast. You can't tell for sure if that person is using same Wifi connection or proxy or if that page was in the Nook Color's cache already. In my experience, browser's comparison are not easy to video tape; in order to be fair, you need to set and clear a lot of factors so you won't get biased results because the cache, internet connection or even browser's default setting.
About comparing Nook Color vs Galaxy Tab that makes total sense to me. They both are tablets, I do not understand why people say Nook Color is an ereader. Nook Color runs on top of Android, similar screen size than Galaxy, has capacitive LCD screen and no keyboard, that's a tablet! The Nook Color UI has been customized (and locked) for marketing purposes so you can only see the B&N "front face" and applications. Besides that there is the price tag which of course, means a faster and better product with the Galaxy.