Download websites that use Instant.Page

About Instant.Page

Preloading on hover is a small bet. Guess that a visitor who paused over a link is about to click it, fetch the page while the cursor is still moving, and the click feels instant even though nothing about the server got faster. The trick costs a fraction of a second of speculative bandwidth and buys a perceptible improvement in how quick a site feels.

Instant.Page is the script that made the technique a one-line addition to any page. Released in 2019 under MIT and written in JavaScript, it needs no build step, no configuration and no changes to the backend. As of October 2026 we detect it on 10,656 sites in the JavaScript libraries category, 3,374 of them in Switzerland and most on .com domains.

Because installing it means pasting a line into a template or adding the WordPress plugin the author publishes, its presence is a decent proxy for who built the site. Page builders and hosted site platforms do not ship it by default, so a site carrying the script usually had a developer or a performance-minded agency decide to add it, someone who reads about perceived latency and acts on it. Content-heavy sites benefit most, since the whole premise depends on visitors moving between pages rather than staying on one.

There is no company behind the script, and the dataset carries no version breakdown for it either. The file is small enough that most sites pin or paste a copy, and the project changes rarely, so the signal you normally get from version spread, which is how well a population keeps up with releases, simply does not exist here. What remains is binary: the script is on the page or it is not.

The obvious caveat is that binary detection depends on recognising the asset. A site that bundles the code into a larger application file, renames it or inlines it will not be counted, which pushes the number down and biases the population toward sites that link the script plainly. Read it as a floor for a technique that is certainly more common than any single implementation of it.

For a researcher the list is most useful as a filter rather than a target. Sites that adopt a small optional performance script tend to also adopt other things developers choose deliberately, which makes the population a reasonable proxy for technically literate sites when you want to sell tooling, hosting or measurement to the people who make those decisions. A single lookup confirms one site uses it. The download tells you how many such sites exist, where they are, and whether the technique is spreading or fading.