One of the nice features of Instagram is that is seems to work almost instantaneously. As soon as you're done writing that witty caption, the image is already hitting the streams of your followers. How does Instagram give this feeling of being such a snappy tool? It turns out that it does a lot of work behind the scenes. As reported by TNW, as soon you apply a filter to your image, Instagram begins uploading in the background. As you type in the information and choose your sharing options, the photo is sent to Instagram's servers behind the scenes, and then the information is applied after the fact.