Once the page loads completely, the user spends few seconds on the page before moving to the next one. The browser is idle during this time and can be used to speed performance of subsequent pages on the website.
For example, in case of search results, it's highly likely that the user will move the the next page once he completes viewing results on the current page. Thus, developers can use intelligent javascript to pre-fetch content of the next page when the browser is idle. This will help the next page load much faster.
Another condition for pre-fetching could be before launching a new version of the site.
New version of a website usually has new static content (javascript, style sheets and images). When a regular user of the site opens this new version for the first time, he will find the site extremely slow. Thus, initially many customers complain about performance.
If we start fetching the static content in the background couple of days before the launch of the new version, customers will not face the slowness and find the performance to be much better. Of course, care has to taken so that there is no clash in names of classes (CSS) and functions (JS).
No comments:
Post a Comment