User blog comment:Deyvid Petteys/Bethesda Reads Our Wiki?/@comment-1992639-20120714171318/@comment-2041582-20120714234208

^ I've also discovered that going as fast as dragons, or just a very high speed, can make the game lag like hell until it eventually crashes. The reason being because it's trying to load and also unload all this cell data at a very fast rate. If you don't know what a cell is, they're basically these giant grids that make up worldspaces in Bethesda's engines (also every indoor area is a cell).