What is Google‘s INP Score and How Can You Improve It in WordPress?
Hey there! If you care about delivering a top-notch user experience on your WordPress site, you‘ve probably heard about Core Web Vitals. These are key metrics that Google considers important for measuring page speed and responsiveness. One new metric that you should get familiar with is INP (Interaction to Next Paint).
In this guide, we‘ll deep dive into what INP means, why it matters for your site, and most importantly – how you can test and optimize your INP scores in WordPress. We‘ll look at best practices for site owners as well as developers, complete with code examples.
Ready to get started? Let‘s go!
Understanding the INP Metric
INP stands for Interaction to Next Paint. This metric measures how quickly your site visually responds to a user‘s interaction, like clicking on a button, link, or image.
Here are the key things to know about INP:
It‘s part of the Core Web Vitals, a set of user-centric metrics Google uses to evaluate overall page experience. Better scores can boost your search rankings.
INP replaces the previous First Input Delay (FID) metric. While FID only captured the delay in processing the first user interaction on a page, INP records all interactions throughout the page lifecycle. This gives a more complete picture of responsiveness.
Google considers INP "good" if it‘s under 200ms, "needs improvement" between 200-500ms, and "poor" if over 500ms. So a lower score is better!
Interactions that count towards INP include clicks, taps, and keypresses. Things like zooming or scrolling aren‘t factored in.
INP is a field metric, meaning it‘s based on real user interactions with your page. Lab data is not used.
Why does INP matter so much? A site that responds slowly to user input will feel sluggish and janky. But a snappy, responsive site leads to happier visitors who engage more and bounce less. Optimizing INP is key to nailing that first impression!
Measuring Your INP Score
Before you can improve your INP, you need to know where you stand currently. Here are some tools you can use to check your score:
- PageSpeed Insights
Google‘s PageSpeed Insights is the go-to tool for measuring Core Web Vitals. Just enter a URL and get metrics for both mobile and desktop.
Look for the "Interactivity" section to see your INP score rated as "Good", "Needs Improvement", or "Poor". You‘ll see separate scores for mobile and desktop.
DebugBear
DebugBear is another helpful tool for tracking Core Web Vitals over time. It also breaks down the specific user interactions contributing to your INP.Chrome User Experience Report
The Chrome UX Report collects real-world INP data for your origin. Look at the 75th percentile number – you want it in the "Good" range under 200ms.
Once you have your baseline INP scores, it‘s time to optimize! Even if your scores are categorized as "Good", there may still be room for improvement.
How to Improve INP Scores in WordPress
Since INP depends on speedy visual responses to interactions, improving it requires a two-pronged approach:
- Minimizing delays in receiving and processing the user‘s interaction
- Ensuring the browser can quickly repaint the screen in response
Let‘s look at some optimizations in both areas that you can apply on your WordPress site.
Tips for WordPress Site Owners
While you may not be writing JavaScript yourself, there are still some steps you can take as a site owner to help your INP times.
Keep WordPress and plugins updated
WordPress 6.2 and 6.3 added some notable performance improvements, especially around the responsiveness of user interactions. So if you‘re not on the latest version, update! Staying on top of plugin updates can also help squash any performance bugs.
Optimize background processes
Heavy background tasks can bog down your site‘s ability to receive user input. Some common culprits: cron jobs, backups, syncing data.
Audit your plugins and look for opportunities to optimize. Can you reduce the frequency of backups? Disable any cron jobs you don‘t really need? Lightening the load frees up resources.
Tackle render-blocking resources
Resources like CSS or JavaScript that are loaded synchronously can delay processing user interactions. Defer what you can!
PageSpeed Insights will flag render-blocking resources and estimate the potential savings. Fixing these makes the biggest impact on slower devices/connections.
Minify JavaScript
Slimming your JS bundle reduces download and parse times. While not a massive gain, trimming unused code can shave off precious milliseconds.
Many WordPress performance plugins like WP Rocket or Autoptimize offer minification. Make sure to test thoroughly afterwards as occasionally minification can break functionality.
Code Optimizations for Developers
Alright devs, this is where you can really move the needle on INP! The goal is to architect your code so event handlers execute quickly and trigger visual updates ASAP.
Immediately acknowledge user interactions
This is the biggest lever you can pull to improve INP. Never leave a user wondering if their click even registered!
Before doing any heavy lifting, first update the UI to signal that the input was received. For example:
// Don‘t do thisbutton.addEventListener(‘click‘, () => {
// Heavy task that blocks update
runExpensiveTask();
button.textContent = ‘Loading…‘;
});
// Do thisbutton.addEventListener(‘click‘, () => {
button.textContent = ‘Loading…‘;
// Defer the heavy task
setTimeout(() => {
runExpensiveTask();
}, 0);
});
In the optimized version, we immediately update the button text before running the expensive task. This buys us time to complete the work without the user noticing a lag.
Optimize long tasks
In Chrome DevTools Performance panel, look for "Long task" warning icons. These highlight tasks that block the main thread for more than 50ms.
Drill in and look for opportunities to optimize chunks of code taking a long time. Some ideas:
- Break up the work into smaller, asynchronous pieces
- Use a web worker to offload processing off the main thread
- Memoize/cache expensive calculations so you don‘t repeat them
Avoid layout thrashing
Interleaving "read" and "write" operations to the DOM can cause the browser to recalculate layout multiple times in a single frame. This murders performance!
// Thrashing – alternating reads and writesfor (const element of elements) {
const height = element.offsetHeight;
element.style.height = ${height * 2}px;
}
// Optimized – batched readconst heights = Array.from(elements, element => element.offsetHeight);
for (let i = 0; i < elements.length; i++) {
elements[i].style.height = ${heights[i] * 2}px;
}
In the optimized snippet, we first batch all the reads into an array. Then we loop through and apply all the writes. This lets the browser figure out the most efficient way to update layout just once.
Prioritize above-the-fold content
Aim to keep your initial render lightning fast by deferring anything below-the-fold. Techniques like lazy-loading images/video can help here.
If a user interaction reveals new content, consider loading a lightweight placeholder first. Once the full content is ready, swap it in.
// Eager loadingbutton.addEventListener(‘click‘, () => {
// Load full image synchronously
const fullImg = loadImage(‘large-img.jpg‘);
fullImage.src = fullImg.src;
});
// Optimize with placeholderbutton.addEventListener(‘click‘, async () => {
// Load placeholder
const placeholder = await loadImage(‘placeholder.svg‘);
fullImage.src = placeholder.src;
// Fetch full image asynchronously
const fullImg = await loadImage(‘large-img.jpg‘);
fullImage.src = fullImg.src;
});
Use the requestAnimationFrame and requestIdleCallback APIs
These APIs let you cooperate with the browser to schedule non-critical work at optimal times.
requestAnimationFrame queues a callback to fire before the next repaint. This is perfect for JS-driven animations. By lining up your visual updates with the browser‘s natural paint cycle, you sidestep layout thrashing.
button.addEventListener(‘click‘, () => {
// Update text immediately
button.textContent = ‘Processing…‘;
// Animate background after layout/paint
requestAnimationFrame(() => {
button.style.background = ‘aqua‘;
});
});
requestIdleCallback lets you schedule low-priority work when the browser is less busy, like during idle time between user interactions. This keeps your event listeners snappy!
button.addEventListener(‘click‘, () => {
// High priority: acknowledge click
button.textContent = ‘Processing…‘;
// Low priority: log analytics events
requestIdleCallback(() => {
logEvents();
});
});
By applying these techniques holistically, you can craft event handlers that react to user input in the blink of an eye.
Wrapping Up
Phew, we covered a lot of ground! While INP may seem daunting at first, remember that every little optimization adds up.
Start by measuring where you‘re at, then aim to shave off delay anywhere you can find it – in your application code, in your web hosting and delivery chain, and your 3rd party scripts.
The beauty of a metric like INP is that it maps directly to user experience. When you hear users gushing about how lightning fast your site feels, you‘ll know your hard work paid off!
Looking to dive even deeper into WordPress performance? Check out some of our other optimization guides:
- The Ultimate Guide to Reducing TTFB in WordPress
- How to Identify and Fix Render-Blocking Resources
- Mastering Lazy-Loading for a Leaner WP Site
Here‘s to crafting delightfully responsive WordPress experiences! As always, leave a comment and let us know what other performance topics you‘d like to see us cover. Happy optimizing!
