GTmetrix Performance Blog

News, updates and guides on GTmetrix and general web performance

Browsers Updated and First Contentful Paint Added

This article may contain outdated material

This article may reference outdated material related to the legacy version of GTmetrix.

In this release, major changes include upgrading Chrome and Firefox and also adding the First Contentful Paint timing.


Browsers Updated

We’ve updated our browsers options – Chrome to version 62.0.3202.94, and Firefox to 54.0.1 – which should provide a more consistent load behaviour for all GTmetrix tests. If you’ve had issues analyzing your site, these updated browsers should now be able to successfully generate a report.

Why isn’t Firefox updated to the latest (v57)?

Firefox 57 abandons the use of XUL based extensions, which GTmetrix requires to generate data like YSlow scores, etc. Current plugins being used by our Firefox browser are not compatible with Firefox 57. For this reason, we will have to maintain the use of Firefox at 54 until we can assess how to proceed with future versions.


First Contentful Paint Now Available

You can find First Contentful Paint on the Timings tab under “Contentful Paint.”

Adding to our list of advanced timings, we now have First Contentful Paint available! First Contentful Paint is triggered when any content is painted – i.e. something defined in the DOM (Document Object Model), and is meant to be more reflective of your visitor’s experience in terms of page load speed.

This feature is only available on our Chrome browser.

Learn more about First Contentful Paint in our article: First Contentful Paint Explained


Disabled Flash on Chrome and Firefox

Flash has been deprecated for a while and requires interactivity to work (i.e. you must click on the Flash module to enable it); thus we decided to remove Flash functionality all together on this update of the browsers.


Simulate Device Bug Fix – Note 4/5/8 and S8/S8+ Resolution and DPPX

Fixed issues where simulated Note 4/5/8 and S8/S8+ screens were displayed incorrectly and not true to device specifications.

We looked at actual Note 4/5/8 and S8/S8+ devices to properly reference the correct resolutions and device pixel ratios.


Other Updates

Other minor updates to GTmetrix include:

  • Upgraded Adblock Plus 1.13.2 to 1.13.4 on Chrome
  • Improved ability to analyze pages with unique behaviours
  • Various bug fixes


Let us know if you run across any bugs or issues and feel free to tell us your thoughts on Twitter (@gtmetrix) or contact us.

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