Loading mp4s are slower than other requests

[DUOLabs333]

As a continuation of #3, loading http://localhost:8080/dkGFq4G.mp4 is slower than loading http://localhost:8080/dkGFq4G.png etc. This may be because it's a video, instead of a gif or image.

[geraldwuhoo]

Not sure there's much I can do about this. Videos are much larger than images and the program will have to spend more time downloading them to serve them. This is also the reason there is support for a Redis cache layer -- images/videos are pretty bandwidth heavy to it makes sense to store them in a local cache.