It could be your internet speed and connection. Once I moved from home to the university I encountered that problem because of the bad internet connection.
You may also have too many programs running at the same time, a slower processor, or a poor graphics card.
Or any combination of all the above.
A warden of Lothlorien meets up a with a rune keeper from Lindon and a friendship is sparked. An elf hunter from Mirkwood finds a minstrel mourning the loss of Edhellen. A captain of Rohan rides to Bree and comes across a burned farm, the only survivor a young woman who'd defended herself with a rusted sword and axe. Thus many adventures begin.