Speed up Google Maps(and everything else) with async & defer
Nikhil John

Huang Xuan If the async script is fetched before the DOMContentLoaded, then parsing will be blocked. The difference and the advantage comes in saving the fetch time, because fetching happens in parallel. If not for async and defer, the browser would also need to wait through the fetch time before rendering the DOM tree, which can vary vastly depending on network latency.

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