Yeah, 2GHz isn't even standard these days..my computer's a 2009 model and it has a dual core at 3.1 GHz.
Also, this game was made in Game Maker. Regardless of how simple it may look, it requires a ton of processing power because Game Maker games are CPU hogs. Trust me, it's the program, not the game itself.
Made a new channel, come see my let's plays if you want~! http://www.youtube.com/user/themorphingfennecfox