Oh sorry to hear that....how many hours are you in.....
Are they always horribly shadows...or after a while of playing..??????
because for my speaking the shadows are the latest problem of my concern !!!!!!!!!
I'm lv 29, 46:37 hrs in, with a save file size of 8403 KB, and as far as I know the shadows have been as horrible as they are now since the very beginning.
Obviously lag / framerate issues should be addressed first (something that's slowly getting worse for me).