Predictive Prefetching

Predictive Prefetching reduces the page load time by ensuring, with high probability, that an object embedded in the page is available on the edge server, before the user's request.

How it works

Unlike regular prefetching, Predictive Prefetching:

  • uses historical data to predict which objects will be required to render a page when a request for that page is received,
  • occurs before the edge server receives the requested page from the origin, thereby saving a round trip to the origin,
  • can detect objects that are not directly embedded in the HTML, like objects retrieved by JavaScript.

Predictive Prefetching is completed on the edge server that receives the parent request. The edge server:

  1. Receives a request from an end user (the parent request) that is enabled for predictive prefetching.
  2. Analyzes the parent request to determine which objects are related to the parent request.
  3. Records statistics about the parent request.
  4. Rates the related dependent objects, based on the URL of the parent request and other request parameters.
  5. Applies the prefetch level to determine whether to prefetch one or more dependent objects.
  6. Fetches dependent objects from the source while the parent request is sent to the origin.
  7. Sends the fetched dependent objects to the client when requested.

Features and options

Field

What it does

Sub-options

Enable

Enables or disables the behavior.

Prefetch Level

Select which prefetch level to apply.
Consider that a higher level can yield higher page performance but may also lead to higher midgress costs and potentially higher load on your origin.

**

  • High
  • Medium
  • Low
**

Did this page help you?