Use optimistic checkout redirect URL loading strategy to improve checkout load time #2520
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🦋 Changeset detectedLatest commit: e683bca The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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What/Why?
As an optimization for the checkout loading speed, this PR adds an optimistic loading of the checkout redirect URL into the client side state at the time the cart page loads. If the user clicks the "checkout" button quickly (within a few seconds of loading the page), they will be redirected immediately, without the need to wait for roundtrip to generate the checkout redirect URL. In practice, this will save about ~500ms of latency on a desktop/strong connection, and perhaps more on mobile.
As the JWT expires after 30 seconds, client side code will compare the
iatandeatagainst the client side time (with a best-effort attempt to account for skew) in order to decide if the JWT should be considered expired, in which case it will be re-generated and the user will be redirected as they were before this change - slower but reliable for this critically important navigation.The net result is an improvement in load speed for shoppers who click "checkout" quickly, who are probably the most impatient ones anyways. :)
Todo:
Testing
Preview deployment
Migration