Performance Testing using GTMetrix

Last Update: April 17, 2024

We all want our websites to load quickly, and there are a number of services out there to help us test, evaluate, and fix various issues affecting the loading speed of our pages. In this series of docs, we will be looking at the major players in this area, Google PageSpeed Insights, GTMetrix, Pingdom and WebPageTest, and how they can help you improve the loading speed of your Avada website. Read on!


GTMetrix is a popular online tool to analyse the load speed and performance of a web page. You can use the service without being logged in, but to take advantage of the full range of free features, you need to sign up for a free account. There is also a different plans, but the free plan is more than enough for the majority of users.

When you visit the site, you are immediately welcomed and invited to get straight to work, with an address bar to input the URL to test. As their website notes “GTmetrix gives you insight on how well your site loads and provides actionable recommendations on how to optimize it.”

GTmetrix Website Welcome

Analysis Options

If you choose to sign up for a free account and log in, you have many more options to customise your tests, including the browser used, the type of connection, and the location of the tests, which can be very useful if you have a local customer base.

Directly under the URL field, you will find a number of clickable options for that particular test. You can click directly on them to make fast changes to your analysis options.

GTmetrix > Start

If you click the Analyse Options on the far right, this will expand to the full options set, where you can choose the following options.

  • Location: By default, the Test Server Region is set to Vancouver in Canada. When you are logged in however, you can choose from Dallas, Hong Kong, London, Mumbai, Sydney or São Paulo.

  • Browser: By default, GTmetrix uses the Chrome browser on Desktop. If you wish, you can change this to Chrome (Android, Galaxy Nexus) or Firefox (Desktop).

  • Connection Speed: By default, GTmetrix use an unthrottled connection, but you can choose from a range of options here, including Broadband Fast, Broadband, Broadband Slow, LTE Mobile, 3G Mobile, 2G Mobile, and 56K Dial-up…

  • Create Video: You can turn this feature on for any test, to help debug page load issues by seeing exactly how the page loads. View the page up to 4x slower to help pinpoint rendering or other page load problems.

  • Adblock Plus: By turning this on, you can prevent ads from loading using the Adblock Plus plugin. This can help you assess how ads affect the loading of your site.

  • Advanced Options: There are also some advanced options a bit further down, around HTTP authentication, cookies, and whitelisting and blacklisting urls.

GTmetrix > Options

It must be noted that these home page options are for individual tests. If you’d like to set your default options for page analysis, head to your Account, linked at the top right of the site, and make your choices in the following dialog.

GTmetrix > Account Options

Performance Report

Once you have set your options, and entered a URL, you click the Analyse button, and GTmetrix goes to work. When the job is completed, you are presented with a Performance Report. This summarizes your page performance, based off key indicators of page load speed into two areas – the GTmetrix Grade, and Web Vitals.

GTmetrix > Performance Report

GTmetrix Grade

  • Performance: The Performance Score tells you how well your page performs from a user perspective. This score is made up of 6 key metrics with the following weights: Loading performance (45%)First Contentful Paint (10%), Speed Index (10%), Largest Contentful Paint (25%), Interactivity (40%)Time to Interactive (10%), Total Blocking Time (30%), & Visual Stability (15%)Cumulative Layout Shift (15%)

  • Structure: The Structure Score tells you how well your page is built for optimal performance. Similar to the PageSpeed and YSlow scores in the Legacy Report, how well you do on your Structure Score is reflective of how well your site is built for optimal performance.

Web Vitals

  • Largest Contentful Paint: LCP measures how long it takes for the largest content element (e.g. a hero image or heading text) on your page to become visible within your visitors’ viewport. For a good user experience, aim for an LCP of 1.2 seconds or less.
  • Total Blocking Time: TBT tells you how much time is blocked by scripts during your page loading process. For a good user experience, aim for a TBT of 150 milliseconds or less

  • Cumulative Layout Shift: CLS indicates how much layout shift is experienced by visitors as your page loads. For a good user experience, aim for a CLS score of 0.1 or less.

Result Tabs


The individual tabs under the Performance summary area, are where you can see what specific areas your website is performing well, or poorly, in. The Summary Tab provides a Speed Visualisation of your site’s loading time, and below this lists the Top Issues, with the results and recommendations on the individual audits. They are ranked with an impact rating, showing the highest impact issues first. There is a link at the right to see the complete list of structure audits, and you can also see these on the Structure Tab.

GTmetrix >Summary Tab

Using the small arrow on the far right of each individual audit result, you can expand the section to see more details, as well as links to further information on how to improve the result.

GTmetrix >Summary Tab > Top issues

Finally, at the bottom of the Summary Tab, you can see a section called Page Details. This breaks down your page content by bith request type and size. You can hover over a segment to see additional information on that request type so that you can understand if your page is heavy on JavaScript, images, video etc.

GTmetrix > Summary Tab > Page Details


The Performance Tab shows the Performance Metrics generated using Lighthouse Performance data, and the Browser Timings, as reported by the browser.

GTmetrix >Performance Tab

If you mouse over the individual metrics, you can see more information and links to learn more.

GTmetrix >Performance Tab > Tips


The Structure tab shows all meaningful audits, as well as displaying a link to display the No Impact Audits. Just like the Summary tab, you can expand each audit to see more details and to get links to more information.

GTmetrix >Structure Tab


The Waterfall tab shows a visualization of content loading behavior. It displays the request-by-request loading behavior of your website. Every script, media file, and/or third-party resource your page requests is displayed here.

If you don’t have experience with these charts, they can be overwhelming. Start by reading this How to Read a Waterfall Chart for Beginners document from GTmetrix.

GTmetrix >Waterfall Tab

Like the other tabs, you can drill down into the specific load events shown in the Waterfall chart for more information, by clicking on the small plus button at the far left.

GTmetrix > Waterfall Tab


It’s also possible in GTmetrix to record and playback a video of the page load, showing yet another visualization of the page load. You can change the speed down to a 1/4 speed to get a good idea of what’s loading when.

GTmetrix > Video Tab


Finally, the history tab, shows you your history of tests with that specific url. Depending on how long you have been using it, there will be more or less data in here for you to analyze.

GTmetrix > History Tab


GTmetrix is a relatively easy tool to use, and very valuable to help detect and remedy issues that may be affecting your website’s load time. Much of it is very technical however, and it does however require time, patience and expertise to learn.

Remember, due to hosting and content variables, website optimization is a very complex, technical area, and falls well outside of the support we can provide for Avada.

Apart from our many documentation resources, the Facebook Avada User’s Group has a large and very active membership, and this topic is regularly discussed on the Group.