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Not surprising as they are using Ember (one of the slowest front end frameworks), Moment (super heavy date library), and they don't even minify their code...

https://js-cdn.music.apple.com/musickit/v2/components/musick...

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Ember itself isn't slow. There are plenty of sites that use it effectively. Most of the sluggishness is due to weird data loading patterns

> one of the slowest front end frameworks

What metric are you referring to here?

The JS frameworks benchmarks.

Here are the latest results: https://krausest.github.io/js-framework-benchmark/current.ht...

As you can see Ember 3.11.1 doesn't fare too well in either performance, startup metrics, or memory consumption. Glimmer does a bit better but that not much.

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