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Performance

2 posts on performance.

The loading experience is the product

A scrub film on my products page is 8,310,726 bytes. Its poster frame is 42,046 bytes, and the poster is the only one of the two most visitors ever see. What the research on skeletons and spinners actually says, what the Core Web Vitals actually measure, and the layout shift my own reveal animation was covering for.

The scroll-scrub stack: what actually makes it smooth

A scrubbed film either reads as liquid or as a slideshow being dragged, and I finally measured where the difference lives. It is the encode. One clip, three encodes, sixty seeks each: a median of 3 ms against 15 ms against 32 ms, with the whole frame budget sitting at 16.7. Here is the loop, the encode, the dead zones, and the one line that makes iPhones cooperate.

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