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Why TTI (Time To Interactive) matters for your website

The speed and responsiveness of your website can be just as critical as the content it holds. A swift and seamless user experience is pivotal in capturing and retaining visitor interest. This is where Time to Interactive (TTI), a lesser-known but crucial performance metric, comes into play. TTI measures how long it takes for a...

Last updated: 9 Jul 2024 - 4 mins read

Sophie Marketeer

CONTENTS

The speed and responsiveness of your website can be just as critical as the content it holds. A swift and seamless user experience is pivotal in capturing and retaining visitor interest. This is where Time to Interactive (TTI), a lesser-known but crucial performance metric, comes into play. TTI measures how long it takes for a page to become fully interactive and responsive to user inputs, shaping the user’s perception of your site’s efficiency.


Understanding and improving TTI can dramatically enhance how users interact with your site, contributing significantly to user satisfaction and retention. Here’s why prioritising TTI is essential for your site’s performance and how it can elevate your business in a competitive digital landscape.

Understanding Time to Interactive (TTI)

TTI is the metric that tracks the time from when a page starts loading to the point where it can reliably respond to user input. It’s a crucial component of your site’s performance because it affects how users perceive the speed and fluidity of your site. Unlike other metrics that may focus solely on load times, TTI provides a more user-centric view, considering how interaction feels to the user.

To give you a feeling of what TTI is good and from when it should be enhanced:

The impact of TTI on User Experience

A slow TTI can lead to frustration and impatience, contributing to higher bounce rates and lower overall user engagement. Users today expect quick interactions; even a few seconds delay can lead them to abandon a site. Improving TTI not only enhances the user experience but also helps in retaining users who might otherwise move on to a competitor with a faster, more responsive website.

Best Practices to improve TTI

  • Optimize JavaScript Loading: Heavy JavaScript can block the main thread, delaying interactivity. Optimize your code by removing unused JavaScript, minimizing large JS libraries, and implementing code-splitting.
  • Efficient Asset Management: Optimize images and offload the hosting of large files. Lazy loading non-critical assets can also help reduce initial load times and speed up TTI.
  • Use a Service Worker: Implementing service workers can help in caching and serving content efficiently, which speeds up both load times and TTI.
  • Prioritize Above-the-Fold Content: Enhance the user’s perception of speed by prioritizing the loading of content that appears first on the screen, also known as above-the-fold content.

Monitoring TTI in Your Analytics

Tracking TTI is essential to understand how changes in your site’s design or content affect interactivity. Tools like Lighthouse, part of Google’s suite of web performance tools, provide a comprehensive look at TTI and other important metrics. Regular monitoring helps pinpoint areas for improvement and assess the impact of optimisations you make.

Measuring TTI – Lighthouse 8 to Lighthouse 10

When analysing a website with the Chrome extension Lighthouse 8, the TTI was still part of the analytics. Now since it’s a very timely sensitive metric, Lighthouse 10 is working with LCP (Largest Contentful Paint) and Speed Index now. (“TTI marks a point in time, but the way it’s defined makes it overly sensitive to outlier network requests and long tasks. Largest Contentful Paint (LCP) and Speed Index are usually better heuristics for a page’s contents feeling loaded than a count of active network requests.” – Chrome blog). However you can still access the source code for Time to Interactive from Google to create your own project and measure the TTI.

To sum up

Your website’s performance can make or break your online success. Time to Interactive is more than just a metric; it’s a reflection of your site’s health and efficiency. By focusing on optimising TTI, you not only enhance user experience but also support your business goals of higher engagement and conversion. Ongoing monitoring with tools like Lighthouse is essential to keep track of TTI and other performance metrics. While the shift from TTI to metrics like Largest Contentful Paint (LCP) and Speed Index in newer versions of Lighthouse reflects an evolving approach to measuring perceived load speed, the goal remains the same: to create a faster, more engaging web experience.

Remember, when it comes to user experience, every second counts.

Ready to boost your business? Flatline Agency is here to help. Let’s grow together!


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