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The Importance of Page Speed Score for Google Ranking

According to Google, it is critical that web experiences are rapid. If there’s too long a wait for your webpage to load, the research shows that users are far more likely to give up and abandon the site in search of a faster one.

This is vital if your website is to rank highly on Google search. We use a tool called PageSpeed Insights to ensure that our websites rank highly (90+) on all devices.

Google anaylitics software
Google search engine
Google speed ranking index

Bounce Rate

Bounce rate is defined as the percentage of visitors to a website who leave after viewing only one page. If your webpage has a low PageSpeed score, the probability of a user leaving your site can increase by over 120%.

Google speed indication screen grab
Source: Google/SOASTA Research, 2017

The Metrics used for Judging a Good Page Score

First Contentful Paint

First contentful paint marks the time at which the first text or image is painted. An FCP score is a comparison between your page’s FCP time and the FCP times for other real websites.

FCP Time (seconds)Ranking
0-1.8Green (Fast)
1.8-3Orange (Moderate)
Over 3Red (Slow)
Statistics taken from

Time To Interactive

Time to interactive is the amount of time it takes for the page to become fully interactive. A page is considered fully interactive when:

  • The page displays useful content, measured by first contentful paint
  • Event handlers are registered for most visible page elements
  • The page responds to user interactions within 50 milliseconds.
TTI Metric (seconds)Ranking
0-3.8Green (Fast)
3.8-7.3Orange (Moderate)
Over 7.3Red (Slow)
Statistics taken from

Speed Index

Speed index shows how quickly the contents of a page are visibly populated. A speed index score is a comparison between your page and other real websites.

Speed Index (seconds)Ranking
0-3.4Green (Fast)
3.4-5.8Orange (Moderate)
Over 5.8Red (Slow)
Statistics taken from

Total Blocking Time

Total blocking time (TBT) measures the total time between your page’s first contentful paint and time to interactive, where the main thread was blocked for long enough to prevent input responsiveness.

The main thread is considered “blocked” any time there’s a task that runs on the main thread for more than 50ms. If the task is long enough, users will likely notice the delay and the page will appear sluggish and janky.

A good TBT score is generally considered to be less than 200ms.

Largest Contentful Paint

Largest contentful paint (LCP) measures the time it takes for the largest image or block of text to render on the page. Elements that are considered for LCP are images, videos, text blocks and background images.

LCP Time (seconds)Ranking
0-2.5Green (Fast)
2.5-4Orange (Moderate)
Over 4Red (Slow)
Statistics taken from

Cumulative Layout Shift

Cumulative layout shift (CLS) is used to measure stability of your page and helps to quantify how often the page unexpectedly shifts. This includes things like text moving whilst you’re reading an article or links and buttons moving when you click on them.

CLS Time (seconds)Ranking
0-0.1Green (Fast)
0.1-0.25Orange (Moderate)
Over 0.25Red (Slow)
Statistics taken from