Last week, Kotaku did an unscientific speed test with the New Nintendo 3DS and the regular Nintendo 3DS. This week, you can see all 3DS consoles, including the NN3DS XL, face off. Let's see which one is the quickest.
The above speed test shows how long it takes to boot up Super Smash Bros. for Nintendo 3DS and comes via Japanese game site 4Gamer.
And here is a downloading speed test.
Appears as though the the XL is the quickest -- at least, in this test.