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Boosted by slightlyoff@toot.cafe ("Alex Russell"):
benschwarz@front-end.social wrote:

Four reasons airline websites are slow, after looking at 111 of them:

1. Server requests block paint. Selecting a date or seat triggers a round-trip that locks the main thread. On the worst site (Air Arabia) P75 mobile interactions take 1.85s.

2. Skeleton loaders that shift layout. One click → INP lockup → skeleton → CLS jump → LCP delay. Even if you can’t make it fast, you can stop it moving.

Horizontal bar chart of the six airline websites with the slowest mobile Interaction to Next Paint, against two vertical threshold lines at 200 milliseconds (good) and 500 milliseconds (poor). All six bars extend well past the poor threshold. Air Arabia 1.85 seconds, TAP Air Portugal 1.4 seconds, Cathay Pacific 1.4 seconds, Wizz Air 1.23 seconds, RwandAir 1.2 seconds, Air India Express 1.18 seconds.