Ever since installing Dawnguard, the load times have been terrible. It’s a good minute each time I enter a load screen. Anyone else have this problem?

Nope, but I did have one time where I was stuck on the loading screen for a very, very long time (didn't actually notice because I was doing something else at the time) but I'm sure that was just a glitch so I reloaded the Xbox. But, anyway, no I haven't seen any marked increases in load times.

I've had more freeze ups since installing Dawnguard, but not longer load times.

Must be something on my end then. Might reinstall the game to my hardrive.

I was stuck in a never ending loading screen when i first tried to enter Castle Volkihar, but other than that fine on loading times
Its freezeups ive experieced once or twice, all late at night though, so the fact that the xbox has been switched on for a while and is heating up could easily explain those xD

I have been playing skyrim all day, tieing up loose ends with the DLC and it didn't have excessive loading times it just froze up my Xbox entirely, it has frozen at least 7 times today, really annoying.