Add local caching to the emotes list

[Mishasama]

Currently, every time I refresh the page and then open the BTTV emotes list, all the emotes have to reload. However, Twitch’s built-in emotes list does not need to reload.

This significantly impacts the page’s overall performance and may even cause the page to freeze, resulting in a stream interruption.
This issue is especially serious in the case of limited hardware performance or network bandwidth.

[Mishasama]

Since we have to connect to the CDN every time to reload a large number of emotes, this generates a massive number of connections to the CDN servers in a short period of time. In addition to consuming a huge amount of bandwidth, this can easily lead to CDN denial-of-service or connection timeouts.
I frequently receive a large number of timeout reports from the following servers.

cdn.betterttv.net
static-cdn.jtvnw.net

[night]

You are sadly mistaken. The emote menu does use caching for emotes. The reason you see a loading state is because we show a filler value while your browser loads the image from its cache or the network.

[Mishasama]

Then why do I get a large number of CDN request timeouts every time I refresh the page and reopen the emote menu?

[night]

If you have the developer console open when you're seeing timeouts, try navigating to the Network tab and checking the "Disable Cache" option (that could be affecting your experience).