Im on ps4. my current save file is 10.06 mb and im lagging so baddly it takes 5 minutes to walk through whiterun. i have no mods active or downloaded. can someone advice me here? i only have 3 save files btw

Try clearing your cache.. and checking to see if the ps4 is hot, check for dust, smudges and scratches on the disc and any dust in the reader.

Also... using another sign-on start another game and see if it lag's also.

I don't know as much about the PS4's ..and that is all I can think of.