Setting up a pre-connection

Content

Preliminary connection to the server

Preloading files

Preliminary connection to the server

Often sites download files from external services. These can be maps or social media widgets. Those, in turn, download data from their sources.

For example, when the Yandex map is displayed on the site, the script is loaded https://api-maps.yandex.ru/services/constructor/1.0/js /, and he requests a photo of the cards from the address https://core-renderer-tiles.maps.yandex.net. Thus, after loading the script, he spends time connecting to the site that gives out pictures.

But you can speed up the work of maps by adding a special code to the page that will create a connection to the address https://core-renderer-tiles.maps.yandex.net even before loading the script itself.

<link rel="preconnect" href="https://core-renderer-tiles.maps.yandex.net" crossorigin />
<link rel="dns-prefetch" href="https://core-renderer-tiles.maps.yandex.net" />

This way you will speed up the loading of the map from a few tens to hundreds of milliseconds.

But it only makes sense if the map or social media widget is on the first screen. In all other cases, postpone loading the map until the rest of the page loads, or until the user scrolls through the page and is about to see the map.

Preloading files

Preloading files does not help to load the page faster, but only helps to display meaningful content faster. Therefore, there is no point in preloading CSS and JavaScript. You will not be able to preload pictures and videos, since it is not possible to upload a picture in accordance with DPR.

It is worth preloading font files in order to display the text content of the page as quickly as possible.

◀ Font display mode Removing lazy loading ▶

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