Originally Posted by top6
This is Bethesda's official Skyrim tech support forum for the PS3:
There's a lot of noise, but you can find the info you need on any tech issue.
This gist on the lag issue is that the game, when it came out, had a huge lag on the PS3. They released a patch in late November that was supposed to fix that issue. They say it did fix it for some people, but some posters there say the problem was worse than before. Unfortunately, the new patch introduced some new bugs into the game, including "backwards flying dragons" and it ruined magic resistance for some people. The last patch they released (1.3) was mostly designed only to correct the problems introduced by the previous patch. Bethesda now says they will introduce a new patch "sometime in January" that will hopefully resolve the PS3 lag issues.
Based on what I've read on that board, it does seem that the problem is related to the size of your save file. There are some tips there on how to lessen issues:
The best tips seem to be to turn off all auto-saves, clear space on your PS3, and if you are really having problems to try waiting somewhere for 30 days (which apparently will reset several things in the game and free up memory, or something).
Geez, waiting for 30 days? That's odd, but I may try it.