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Interesting to see Apple starting to move into the web app product space (aside from iCloud, of course). Must say though that performance feels a bit sluggish (esp. hover states) on a Macbook Pro (tested in Firefox, Chrome and Safari).

Results of a Lighthouse audit (London): https://www.dropbox.com/s/jaf3gmgo0tpanba/Screenshot%202019-...

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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...

> 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.

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

Are any of the iCloud web apps viable at all? Each time I've tried using them the performance has been terribly slow.

iCloud web apps have been completely abandoned. A bug with adding contact photos has existed for like 15 years.

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