Also called Core Web Vitals, load time
Page speed is how quickly a page becomes visible and usable, measured by metrics such as Largest Contentful Paint and Interaction to Next Paint.
Two moments matter more than total load time: when the main content appears, and when the page responds to the first tap. A page that shows its heading in one second and ignores taps for four is experienced as broken, whatever the total figure says.
Mobile networks set the real budget. A page tested on office wifi and a laptop bears little relation to the same page on a mid-range phone on cellular data, which is how most social traffic arrives.
The heaviest items on creator pages are almost always images and third-party embeds. Correctly sized images and deferred embeds recover most of the loss.
In practice
Three players loading above the fold can delay interactivity by seconds; replacing them with preview images that load the player on tap removes the delay entirely.
Common mistake
Optimising code before images. Uncompressed photos usually outweigh every script on the page.
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