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HTTP/2 is faster in all the cases than the old standard, and often quite considerably.

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Bootstrap 4 is 30% smaller than the latest Bootstrap 3 build! It previously was around ~123kb and now is a mere ~88kb. This is a huge reduction for not losing any features.

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Why you should never, ever, ever use MongoDB

doSomething().then(function () {
  return doSomethingElse();
});

doSomething().then(function () {
  doSomethingElse();
});

doSomething().then(doSomethingElse());

doSomething().then(doSomethingElse);