I had this problem on one of my consoles after updating them to AoI - the game would get way too laggy, almost to the point of being unplayable. After doing a little research, I found something that eventually remedied the problem.
We'll be using the Xbox 360 Cache reset code to clear the cache. This clears the cache (which includes title updates) ONLY; everything like your downloaded content, saves, etc, will be fine.
First off, you'll need to be at the Xbox 360 Dashboard. From there, go to the system tab and select memory. After that, press 'Y' over the hard drive. You should be in a menu with two options: Rename and reformat. Now all you need to do is hit the following button combo:
X, X, Left Bumper, Right Bumper, X, X
After successfully entering the button combination in, you should see a message asking if you'd like to perform maintenance on your Xbox 360. Select yes. When it's finished, simply pop in PSU, re download the update, and play!
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