Google Lighthouse Performance

The Google Lighthouse performance score is a metric that measures the speed and performance of a website. It’s an overall score that ranges from 0 to 100 and is generated based on a number of different performance metrics, such as the time it takes for a website to load, the time it takes for a website to become interactive, the size of the resources used by the website, and other factors that impact the user experience.

A high performance score in Google Lighthouse indicates that a website is fast and responsive, which can lead to a better user experience and improved search engine rankings. On the other hand, a low performance score can indicate that a website is slow and unresponsive, and can negatively impact the user experience.

Mobile Performance
Desktop Performance

Core Web Vitals

Core Web Vitals are a set of specific factors that Google considers important in a webpage’s overall user experience. Core Web Vitals are made up of three specific page speed and user interaction measurements: Largest Contentful PaintFirst Input Delay, and Cumulative Layout Shift.

Largest Contentful Paint5.2 s5.4 s< 2.5 s
First Input Delay2,130 ms470 ms< 100ms
Cumulative Layout Shift0.0460.046 0.1


Optimise images

By optimising the following images, roughly 2 MB could be removed from the transfer size, about 33%. This would reduce the CO2 generated per page load from 1.81g grams to 1.21 grams.

Images should be optimised for the web for several reasons:

  1. Reduced file size: Optimizing images can result in a smaller file size, which can help to reduce the amount of data that needs to be downloaded. This can lead to faster page load times and improved performance.
  2. Improved user experience: Optimising images can help to improve the overall user experience, as pages with optimised images load faster and are more responsive.
  3. Lower emissions: Optimising images can help to reduce the emissions associated with data transfer, as less data needs to be transmitted over the network.
  4. Better accessibility: Optimising images can make them more accessible to users with slower connections or limited data plans.
Water-main-replacement.jpg 1 MB 18% 1,004 KB
pexels-daniel-534736-scaled.jpg 751 KB 11% 507 KB
Customer-Advisory-Committee-4.jpg 394 KB 6% 150 KB
water-hero-1.jpg 389 KB 6% 145 KB
Hay-scaled.jpg 369 KB 5% 125 KB
Annual-report-cover.jpg 344 KB 5% 100 KB
News-Flow-March-2023-Bairnsdale-Advertiser-version_1-scaled.jpg 296 KB 4% 52 KB

Subset large font files

Fonts should be subsetted to reduce the file size, improve performance, and reduce emissions. Subsetting a font involves removing any characters that are not needed for a particular use case, resulting in a smaller file size and faster page load times. Some specific reasons why fonts should be subsetted include:

  1. Reduced file size: Subsetting a font removes any unused characters, which can result in a smaller file size. This can help to reduce the amount of data that needs to be downloaded, leading to faster page load times and lower emissions.
  2. Improved performance: Fonts that are subsetted are faster to load and render than fonts that are not subsetted. This can help to improve the overall performance of a website, leading to a better user experience.

Overall, subsetting fonts is a good practice for anyone looking to optimize the performance and reduce the emissions of a website of a website.

modules.woff ~91 KB ~73 KB
6xK3dSBYKcSV-LCoeQqfX1RYOo3aOg.woff2 ~57 KB ~40 KB
6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vAlQ.woff2 ~57 KB ~39 KB
6xKydSBYKcSV-LCoeQqfX1RYOo3ik4zAlQ.woff2 ~57 KB ~39 KB
memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0RkyFjaVI.woff2 ~56 KB ~39 KB
memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0C4i.woff2 ~56 KB ~38 KB
memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1y4i.woff2 ~56 KB ~38 KB
memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0C4i.woff2 ~56 KB ~38 KB
memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1y4i.woff2 ~54 KB ~37 KB

Convert font files to woff2

WOFF2 is considered to be the best font format for web use because it provides a good balance of file size and compatibility. Some specific reasons why WOFF2 is a good font format include:

  1. Small file size: WOFF2 is a compressed font format, which means that it has a smaller file size compared to other font formats like TTF or OTF. This is important for web use because smaller file sizes can help to reduce the amount of data that needs to be downloaded, leading to faster page load times.
  2. High-quality font rendering: WOFF2 provides high-quality font rendering, making it a good choice for use on the web.

It’s worth noting that WOFF2 is not the only font format that can be used on the web, and there may be cases where other formats like WOFF or TTF are more suitable, depending on the specific requirements of the website. However, for most cases, WOFF2 is considered to be the best font format for web use due to its combination of small file size, good browser support, and high-quality font rendering.


Remove third party font files

Font files should be loaded from the same hosting as the website because

  1. Increased loading time: Third-party sub-resources, such as scripts, fonts, or images, need to be downloaded from a separate server before they can be displayed on the website. This can increase the overall loading time of the page, leading to a slower user experience.
  2. Dependence on external servers: The loading of third-party subresources is dependent on the availability and performance of the external servers that host them. If these servers are slow or unavailable, it can result in slow page loading times or even errors.
  3. Increased risk of security threats: Third-party subresources can introduce security risks to a website, as they can contain malicious code or be used to track user activity.

First Contentful Paint

First Contentful Paint (FCP) is a performance metric that measures the time it takes for the first piece of content to be rendered on the screen when a user navigates to a web page. This content can be any visual element on the page, such as text, images, or a background color.

FCP is important because it directly affects the perceived speed of a website, and can impact user engagement and conversion rates. A faster FCP can lead to a better user experience and improved performance.

Here are a few ways you can optimise your FCP:

  1. Optimise images: Large, unoptimised images can slow down a page’s FCP. You can optimise images by compressing them, reducing their dimensions, and choosing the right format for each image.
  2. Minimise HTTP requests: Each resource requested by a web page, such as images, scripts, and stylesheets, requires a separate HTTP request. Minimising the number of HTTP requests can help to reduce the time it takes for a page to render.
  3. Prioritize critical content: Prioritizing critical content, such as above-the-fold content, can help to ensure that users see something on the screen quickly, even if the rest of the page is still loading.
  4. Reduce server response time: A slow server response time can significantly impact FCP. Optimizing server-side code and server settings can help to reduce response times and improve FCP.
  5. Use a performance monitoring tool: There are many tools available that can help you monitor your website’s performance, including FCP. These tools can help you identify performance issues and track your progress as you implement optimizations.
Timing4.4 s1.1 s

Largest Contentful Paint

Timing5.2 s5.4 s

Total Blocking Time

Timing5,480 ms760 ms

Cumulative Layout Shift


Speed Index

Timing12.3 s4.4 s

Time to Interactive

Timing21.4 s4.2 s

Max Potential First Input Delay

Timing2,130 ms470 ms

First Meaningful Paint

Timing4.4 s1.1 s

Eliminate render-blocking resources

InsightPotential savings of 3,200 msPotential savings of 740 ms

Properly size images

InsightPotential savings of 255 KiBPotential savings of 2,225 KiB

Defer offscreen images

InsightPotential savings of 389 KiBPotential savings of 389 KiB

Minify JavaScript

InsightPotential savings of 4 KiBPotential savings of 4 KiB

Reduce unused CSS

InsightPotential savings of 98 KiBPotential savings of 102 KiB

Reduce unused JavaScript

InsightPotential savings of 646 KiBPotential savings of 647 KiB

Efficiently encode images

InsightPotential savings of 47 KiBPotential savings of 5 KiB

Serve images in next-gen formats

InsightPotential savings of 657 KiBPotential savings of 1,785 KiB

Enable text compression

InsightPotential savings of 7 KiBPotential savings of 7 KiB

Reduce initial server response time

InsightRoot document took 340 msRoot document took 680 ms

Preload Largest Contentful Paint image


Avoid enormous network payloads

InsightTotal size was 4,428 KiBTotal size was 7,031 KiB

Serve static assets with an efficient cache policy

Insight73 resources found77 resources found

Avoid an excessive DOM size

Insight964 elements964 elements

Reduce JavaScript execution time

Timing10.8 s2.5 s

Minimize main-thread work

Timing17.2 s4.4 s

Reduce the impact of third-party code

InsightThird-party code blocked the main thread for 7,470 msThird-party code blocked the main thread for 1,540 ms

Largest Contentful Paint image was not lazily loaded


Uses passive listeners to improve scrolling performance