Overview

Speed Index (SI) is a metric that measures how fast your page is visually complete above-the-fold (what you can see without scrolling).

SI is a calculation that reflects your visitor’s page experience utilizing a frame-by-frame analysis of your page’s load behaviour.

How to improve Speed Index?

Most performance optimizations that result in a faster First Contentful Paint and Largest Contentful Paint are also likely to result in a faster Speed Index for your page.

Some of the optimizations here include:

  • Reducing JavaScript execution time
  • Minimizing main-thread work
  • Replacing large JavaScript libraries with smaller alternatives
  • Removing unused JavaScript
  • Reducing the impact of third-party code

How to improve Speed Index with Staq

Under Staq Hosting > JavaScript > Site Optimizer you will see numerous opportunities to improve Speed Index such as Minify Javascript files, Minify JavaScript files, Combine all JavaScript etc.

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