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Jon Cartu Review: A 10-Step Process for Understanding Site Performance & Auto…

Ruth Everett

Jon Cartu Review: A 10-Step Process for Understanding Site Performance & Auto…

It’s no secret that site speed is important for SEO.

Not only is it used as a ranking factor by Google, but it’s also imperative for providing a good experience for users from the second they land on your site.

A slow website and poor performance will impact user experience and accessibility, as well as affect a business’s growth and, ultimately, revenue.

In fact, organizations that have invested efforts into speed improvements have seen an increase in website traffic, better engagement, and an uplift in conversions.

Pinterest is one example of this where, after implementing a performance budget, they saw an uplift in both user sentiment and engagement, which translated into a 44% increase in revenue.

A Blueprint for Performance Optimization

With all of this in mind, Paul Irish and Elizabeth Sweeny from the Google Chrome Web Platform shared a useful blueprint they have created to assess and optimize site performance, at the 2019 Google I/O event.

While this was primarily focused on development teams, there are some key tasks that are useful for SEO professionals, which I have explored further in this post.

Working on these areas will provide an opportunity for you to work more closely with your development team toward one common goal:

Providing the best experience possible for your users.

Here’s how to do it.

1. Gain an Understanding of the Key Metrics

The first step is to understand the key metrics which are used by Google when measuring a website’s page speed.

Fortunately for us, Google is open about these metrics and have detailed them clearly on a dedicated section of their development site.

The current metrics used by Google are:

  • First Contentful Paint (FCP)
  • Largest Contentful Paint (LCP)
  • First Input Delay (FID)
  • Time to Interactive (TTI)
  • Total Blocking Time (TBT)
  • Cumulative Layout Shift (CLS)

Each of these metrics has different weights, which impact the overall performance score provided.

A number of these metrics have been used by Google for several years, however, they have recently introduced some newer ones, which have become increasingly important:

Largest Contentful Paint (LCP)

This user-centric metric displays the render time of the largest element that is visible in the viewport.

Total Blocking Time (TBT)

TBT measures the load responsiveness of a website and quantifies the non-interactivity of a page before it is usable.

Cumulative Layout Shift (CLS)

Another user-centric metric, CLS measures the visual stability of the page by quantifying how often users experience unexpected layout shifts.

2. Measure the Quality of User Experience

This step involves measuring the performance impact for real users on your site, so it is important to prioritize the metrics that matter most.

Google has put together a useful matrix that can help you to think about the user’s expectations and the metrics associated with them.

Measuring User Experience

Using this matrix to analyze the most impactful performance metrics, from those listed above, is helpful when it comes to prioritizing optimization work.

3. Gain an Overview of Your Page Speed

The next step is to review your site’s performance. When working with large sites, it’s always best to pick a selection of key pages to perform this analysis on.

This could be pages that drive a significant amount of revenue or receive a lot of traffic.

Also, if your site has templates for key pages, you can analyze a number of these in order to understand a base level of performance across the site.

Performing Page Speed Tests

There are several tools which allow you to perform page speed tests, a number of these are free and are great starting points for gaining key insights into a website’s performance.

Google’s Pagespeed Insights

This free tool from Google utilizes a combination of lab data from Lighthouse and field data from the Chrome User Experience report in order to analyze the content of a webpage and provide recommendations for improvement.

Google's Pagespeed Insights

It allows you to test both the mobile and desktop experience and displays a score out of 100, based on the metrics we spoke about above.


GTMetrix is another free tool that provides a speed metric breakdown along with optimization opportunities.

Another useful feature is the ability to customize tests based on location, device and browser types, so this can be used to mimic different browsing environments.


Use a Web Crawler

While the tools above are useful for analyzing on a page-per-page basis, if you wanted to perform measurement at scale, as well as see visual trends, utilizing a crawling tool is very beneficial.

Using a Crawler

For example, by using DeepCrawl’s custom JavaScript feature you will be able to extract a number of key metrics from Chrome. (Disclosure: I work at DeepCrawl.)

Not only does this enable you to gather useful insights at scale, you will also be able to see a visual trend of site speed over time.

4. Discover Specific Aspects Affecting Page Load

There are a number of factors that may be affecting your page speed. Some of the main culprits include:

  • JavaScript-heavy resources.
  • Large image file size.
  • Having a large number of redirect chains.

Using Chrome Dev Tools will enable you to discover any specific aspects on a page which are affecting load time.

The most useful report for this sits under the Coverage tab and allows you to run a recording to test the load of a specific page.

Chrome Dev Tools

Not only does this allow you to review which resources have an impact on user experience, but you will also be able to understand the time taken for the loading, rendering, and painting of different aspects of the page.

This will allow you to pinpoint specific problem areas that are affecting the load speed.

5. Set Specific KPIs to Track

It’s important to remember that every website is unique, with specific challenges and individual success metrics.

These will differ depending on the main goal of the website, and the KPIs will be dependent on these goals.

For example, an ecommerce client I once worked with was looking to increase sales from organic traffic, so set a KPI to “increase sales from organic users…

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