The quality of the render can also be adjusted - but this has a knock-on effect on render times. Using a ray tracer to render the scene results in improved soft shadows and depth-of-field blur, plus sharper light transmission for video projection and realistic effects such as light streaming through a stained glass window. This will save anyone and everyone who uses After Effects, even just for quick little projects, a ton of time. You can set how much storage will be used for the global performance cache in your preferences. This even holds true when you close and re-open the program.
CS6 is being touted as the biggest release in quite some time for After Effects, namely because of one major update: the Global Performance Cache. It has huge tools and featured animation sectors that can change the looks of a video.