SharedArrayBuffer will arrive in Android Chrome 88. It will only be available to pages that are cross-origin isolated. Starting in Desktop Chrome 92 it will also only be available to cross-origin isolated pages. You can register for an origin trial to retain the current behavior until Desktop Chrome 113.
Intensive throttling takes effect when the page has been hidden for more than 5 minutes, the page has been silent for at least 30 seconds, WebRTC is not in use, and the chain of timers is 5 or greater.
Background sync is a new web API that lets you defer actions until the user has stable connectivity. This is useful for ensuring that whatever the user wants to send, is actually sent.
Every click interaction in mobile browsers is hampered with a 300ms delay, but that's gone in Chrome 32 for mobile-optimized sites!
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