Before I start let me give information about my character.
50 hours in
lvl 31
11MB save file.
So, as you guessed i cant continue playing this character because the framerate is really PATHETIC to say the least. So I decided to do some testing, since Bethesda does not give a damn about testing it seems.
What I did was saving my main character in Whiterun. Then I create a new character starting a brand new game. I go to Whiterun and I save my game on the exact same location at the exact same time of the day with my main character. This save file is 3MB. I completely shut down my PS3 ( I play on a brand new 320gb slim btw).
I boot the console and load my original character who is level 31. The game lags and stutters a lot but not as much as if I continue playing for 30 mins or so. If I do that the game becomes simply unplayable. Whenever I walk by a char that talks the game stutters. Whenever something is streamed in the distance the game stutters. In other words the game stutters pretty much all the time. Now while in Whiterun, I go to the menus and I load my new character's 3MB save file.
The game continues to stutter but considerably less. It still stutters though and it is not normal. What I do now is I shut down my console entirely. Now I boot the game and this time I load first my new character (3MB save). And ALAS... the game runs pretty much perfectly... No more stuttering, no hiccups, no lag, no crazy framerate, nothing. I even went outside Whiterun and the game run just great... Now through the menus, I load my normal save file. Stuttering, lag appear again... (like I said not in the worst of conditions but that is just a matter of minutes to become unplayable)
I repeat the entire process without any changes 2 times and the results are always the same.
If I load my normal character first then the new character will lag as well. If I freshly start with the new character the game runs smoothly until I load my normal character.
Seriously I dont know what the [censored] is going on, I just wanted to share with you my findings...

