A speedrun is normally something you associate with a video game, when a player tries to get through a game as fast as is humanly (or sometimes inhumanly) possible.
Here, though, we see a movie speedrun. An animated whirlwind tour of Star Wars: Episode IV.
Funny how good the movie is even when you're not neck-deep in tired old quotes.
Speedrun (#3) - Star Wars Episode IV: A New Hope [YouTube]
Someone's Done A Speedrun Of Star Wars. The Movie.