I did a search and didn't see anything else about this under the xbox section.

The interiors of large buildings, the Corvega plant for example, get serious lag and framerate drops. The game normally runs pretty smooth, but its very obvious to me when it happens. Ive only experienced low framerate a few times while outside and it was nothing like what im experiencing indoors. It becomes difficult to play it gets so bad. Maybe there is some optimization that can be done for the next update.

Ive experience the same thing....happens in certain areas yea I hope they fix the framerate a little better then id be super happy with it.

I will say it is better after I have killed the turrets that were inside. I think they use a lot of the processing power of the xbox. Noticed a good decrease in lag/framerate drop after I destroyed the turrets. Could have also been the normal raiders also.

I started that off coming in the pipe at the lowest level and it went smooth no lag or stuttering.

Just hope Bethesda support team reads these forums...pretty sure they do...this is the official forum?