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Supersedes #9316, in which @stubailo demonstrated that SockJS can be straightforwardly eliminated if native WebSocket support is assumed. Native WebSocket support is close to universal now (94% of all clients according to https://caniuse.com/#feat=websockets), which means we can remove ~30KB of legacy code from the client bundle that we send to most web browsers. To achieve this flexibility, the sockjs-0.3.4.js script is injected as a standalone <script> tag in the <head> of the document, but only if the user agent string of the HTTP request fails to convince the sockjs-shim package that the browser has native WebSocket support. When Meteor is running in production, a minified version of that script is used instead. Not only is this loading strategy a bit faster for older browsers, because the SockJS script begins loading earlier, and is independent from the normal JS bundle, it also removes the cost of loading SockJS completely for more recent browsers. Though it's tempting to keep hacking the SockJS script to make it smaller, we should avoid spending too much time on that, since it only benefits a small portion of users whose devices are likely to have poor performance for lots of other reasons. In other words, I think we should keep [Amdahl's Law](https://en.wikipedia.org/wiki/Amdahl%27s_law) in mind.
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