Taking a quick look at a random tweet through the network tab, about 2/3rds of the time spent is on downloading files. Now should Twitter preload a bunch of vid

Taking a quick look at a random tweet through the network tab, about 2/3rds of the time spent is on downloading files. Now should Twitter preload a bunch of videos from recommended tweets it shows below the tweet? Probably not. Does Twitter need megabytes of JavaScript just to show a tweet? I'd hope not. Those things do appear to be the main bottleneck however.