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How to Use GTMetrix Plugin to Improve WordPress Site Performance

Do you want to use GTmetrix to test your WordPress site’s speed?

Many WordPress sites are slow due to factors such as slow web hosting, large image files, poorly coded plugins, etc.

In this article, we’ll show you how to use the GTmetrix plugin to test and improve WordPress site performance.

How to use GTmetrix plugin to improve WordPress site performance

What is GTmetrix?

GTmetrix is a website speed check tool that allows you to see how fast your website loads. Website speed is more important than ever now because people have very short attention span.

According to a StrangeLoop case study that involved Amazon, Google, and other larger sites, a one-second delay in page load time can lead to a 7% loss in conversions, 11% fewer page views, and a 16% decrease in customer satisfaction.

Strangeloop case study

GTmetrix gives you a glimpse of what’s slowing down your website with suggestions on what to do to improve your WordPress performance and speed.

That being said, let’s take a look at how to use GTmetrix plugin to improve your website speed.

Setting up GTmetrix Plugin in WordPress

First, you need to install and activate the GTmetrix WordPress plugin. If you’re not sure how to do this, be sure you check out our full guide on how to install a WordPress plugin.

Upon activation, the plugin will add a new menu item labeled ‘GTmetrix’ in your WordPress admin sidebar. You need to click it to visit the plugin’s settings page.

GTmetrix plugin settings

On this page, you’ll be asked to provide your GTmetrix account email and API keys.

You can create a free account to get the API keys. This free account will come with a limited number of requests per day. However, if you are using this on one website, then you’ll likely never run out of credits.

Simply go to the GTmetrix website and sign up for an account.

After creating your account, click on the ‘User settings’ link at the top and then click on ‘GTmetrix API Details’ link under Account Settings.

GTmetrix account settings

On the next screen, simply click on the Generate API key button. GTmetrix will generate an API key for you which need to copy.

GTmetrix API

Now, you can switch back to the ‘GTmetrix’ plugin settings page in your WordPress dashboard. Go ahead, and enter your account email address and the API Key you copied earlier.

Don’t forget to click on the ‘Save Changes’ button to store your settings.

Now that you have set up the plugin, you can run your WordPress performance tests.

Simply go to the GTmetrix » Tests page. From here you can quickly test your website’s homepage by clicking on the ‘Test your Front Page now’ button.

GTmetrix tests

You can also run performance test for any page on your WordPress website. Simply enter the URL of the page under the ‘Test performance of’ box.

For these custom tests, you can also provide a label and choose a geographic location. Ideally, you would want to focus on locations closest to your target audience.

Running a custom test using GTmetrix

Understanding GTMetrix Performance Test Results

GTmetrix offers a complete break down of the performance for the page you are testing. It uses Google Page Speed and YSlow performance tests to score your page load and will show an overall score as result summary.

Site results

Anything below A means there is room for improvement. However, this does not necessarily mean that your website is terribly slow.

To understand the score, you need to click on the ‘Detailed Report’ link, it opens up your URL on the GTmetrix site.

This report gives you a detailed breakdown of your PageSpeed score, YSlow score, and a list of recommendations on what you can adjust to improve your page speed.

Performance score

It is divided into different tabs. First, you’ll see your page speed score with different ranking items listed with their individual score.

Green items are good and don’t need your attention. Red items are slowing down your website and require further investigation.

The best part is that when you click on the item, it tells you exactly what needs to be fixed.

GTmetrix issues to fix

That’s just one of the examples. Each tab has a little ‘What’s this mean?’ button. If you click on that, it will give you the details on what can be improved.

Here’s an example from the YSlow tab:

What's this mean button

You can find all your past reports on GTmetrix » Tests page, under the Reports section.

GTmetrix reports

This allows you to manage and run tests as you work on improving your website speed and performance.

Using GTmetrix Without a Plugin

If you want to use GTmetrix without installing the plugin, then you can simply go to their home page and then enter your URL.

GTmetrix test no plugin

After you test your site, you’ll get a detailed report just like you did with the plugin.

The disadvantage of this method is that you cannot save different reports and compare them as your website speed gets better.

Tips to Improve Website Performance

The GTmetrix speed check will show you a ton of information. However, you may want to compare your results using an alternate website speed check tool, like IsItWP Website Speed Test Tool or Pingdom.

If your website is still showing low scores, then you can go through details and improve each item one by one. However, this would get too technical for a beginner level user.

The following are some quick tips to help you instantly improve website speed issues without any special skills.

1. Use Best WordPress Hosting

If your WordPress hosting provider is not good, then there is not much you can do to improve the performance of your website.

Here’s our recommendation of the top 3 fast web hosting companies you can try:

2. Set up WordPress Caching Plugin

All top WordPress hosting companies now offer built-in caching solutions that you can turn on to improve website speed. But you can also use a WordPress caching plugin to improve your website performance.

Caching allows your website to load a page from a temporary file instead of running a new request. We recommend using WP Rocket, it is the best WordPress caching plugin on the market.

3. Optimize Images for Faster Page Load

Images take more time to load than text and if a page has a lot of images then it slows down your website. On the other hand, images are important for user engagement and you cannot avoid them.

The solution is to optimize WordPress images for faster page load. You will still use the same images but with smaller file sizes.

There is a lot more you can do to make your website load even faster. We have compiled a complete WordPress speed and performance guide for beginners with step by step instructions to improve your website speed.

We hope this article helped you learn about how to use the GTmetrix plugin to improve your WordPress site performance. You might also want to check out our proven tips on getting more traffic to your website, and our comparison of the best email marketing services to connect with your visitors after they leave your website.

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Reader Interactions

8 CommentsLeave a Reply

  1. Nice post about GTmetrix. I agree with that GTmetrix is awesome (paraphrasing) with one caveat… Though I could probably somehow fix my issue within account settings. Here it is; it doesn’t seem to be recognizing maxcdn. My site is much much faster since I began using maxcdn. I definitely am using cdn but it says that I’m not… Not sure why this is but it even shows the netdna url in the links under the tab that says I’m not using CDN. Also, my Yslow score is slighly higher in the firefox & chrome Yslow addons which do recognize maxcdn… Still, it is an awesome site that I have been able to use to increase my page load speeds significantly.

    • When using custom CDNs like MaxCDN, these providers do not recognize them by default. You have to edit your browser settings to let them know that the netdna URL is actually a CDN. So in short these tools are a good reference point, but not entirely perfect when it comes to detecting CDN.


  2. Hey, GTMetrix provides optimized versions of the images on my site that I can save and use to replace my original, unoptimized images. Though, I have a few thousand images on my website and saving each optimized image, in order to replace all of my original images, take a really long time.
    What exactly does GTMetrix use to provide me with a list of reoptimized and compressed images?
    I tried the plugin for wordpress, but sadly GTMetrix still tells me that I can compress some of my images by up to 50% or so.
    I have even emailed them, but no reply. I am already using a CDN, but it’s just not as fast as I need.

  3. Thanks for letting us know of this plugin, i have been using it for about a week now not knowing they have a plugin. great article and continue such a good job

  4. I don’t see a point using a plugin while you can use the Pingdom tools. It’s not you’re going to test this every day…

  5. Hello, these are some of the useful tips that i am unaware of mostly. I will try if I can make to do this kind of task. Thanks for shearing.

  6. Loving this tool… good point about YSlow not picking up CDNs helps explains some of the differing speed reports.

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