This will remove all shadows, increase your frame rate, and remove shadow striping. Without the shadows being rendered within the processor, you will experience much better frame rates.
If you absolutely, positively need a reliable companion then you want Haez. She is deadly, has a multi-faceted spell list, and carries the "Fanged Katana." The best spellsword in Skyrim. She also carries a torch, a bow, and has her own set of Glass Armor. [Standalone Modification]