PS3 Skyrim becomes unplayable after 6MB+ save file.

[SvennoJ]

I did get some slowdown last night, but nothing major yet. My save file is 5.5mb now :/
I manged to get through fallout NV without frame rate issues, although it crashed 6 times during my play through.
Hopefully it will keep working. Will deleting the game data and re-installing help?