What is INP? (What is Interaction to Next Paint?)

Ever been on a website, clicked a button, and felt like nothing happened for a moment? It’s like pressing a doorbell and waiting a little too long for the sound. That tiny pause can be a bit frustrating, right? Well, there’s a special measurement that helps websites understand how quickly they respond to your actions. It’s called INP, or Interaction to Next Paint. Think of it as the website’s quickness report card. When a website has a good INP score, it feels super snappy and fun to use, making your online adventures much smoother.

What is INP, Really?

INP stands for Interaction to Next Paint. Let’s break down what those big words mean in a simple way. Imagine you’re playing a game on your tablet or clicking around an online store. Every time you touch the screen, click your mouse, or type on your keyboard, you’re performing an “interaction.” It’s your way of telling the website, “Hey, I want to do something!”

The “Next Paint” part is what happens right after your interaction. It’s the moment the website shows you that it understood what you did. For example, if you click an “Add to Cart” button on an online store, the “Next Paint” might be the cart icon updating with a “1” or a little message popping up that says, “Item added!” If you click a picture, the “Next Paint” might be the picture opening up bigger on your screen. It’s the visual change you see.

So, putting it all together, INP measures the time from when you perform an action (like clicking) to when you actually see the website respond with a visual change. It’s about how quickly a website reacts and shows you the result of your actions. A website with a good INP score feels like it’s listening to you instantly, while a website with a poor INP score might feel slow, clunky, or even broken.

It’s a truly helpful way for website builders to know if their site feels responsive and quick to people who are using it, whether they are shopping for clothes, reading an article, or just browsing. A website might look beautiful, but if it doesn’t respond quickly, it can still be frustrating for visitors.

Why Does a Fast INP Matter for Everyone?

You might be thinking, “Why is this INP thing so important?” Well, it’s a big deal for both people who visit websites and for the businesses that own them. Let’s look at why:

For Website Visitors (Like You!)

• Better Experience, Less Frustration: Imagine trying to color a picture, but your crayon keeps lagging behind your hand. Annoying, right? A fast INP means your online experience is smooth. Buttons respond when you click them, pages change quickly, and everything feels natural. This means less waiting and more enjoying your time online.
• Feeling of Control: When a website responds instantly, it feels like it’s truly listening to you. You feel in control, not like you’re fighting with a slow machine. This makes using the website a much more pleasant adventure.
• Trust and Reliability: A website that responds quickly often feels more professional and trustworthy. If a site is slow and unresponsive, it might make you wonder if it’s well-built or even safe to use, especially if you’re thinking about making a purchase. You want to feel confident when you’re interacting with an online business.

For Businesses with Websites (Like Online Stores)

• Happy Customers Stay Longer: Just like you prefer a smooth experience, so do customers. If an online store is fast and easy to use, shoppers are more likely to stick around, browse more items, and spend more time exploring. This can lead to more sales and a better reputation for the business.
• Google Likes It: Search engines like Google want to show people the best websites. Websites that are fast and provide a great user experience often get a little boost in search results. This means more people can find the business’s website when they’re searching for products or information.
• More Sales and Higher Conversion Rates: Think about it: if a customer clicks “Add to Cart” and nothing happens for several seconds, they might get frustrated and leave before buying. A fast INP makes the shopping journey smooth, from finding a product to checking out. This smooth experience can significantly increase ecommerce conversion rates, which means more visitors complete their purchases.
• Better Customer Retention: When customers have a good experience, they are more likely to come back again and again. A snappy website is a key part of that good experience, helping businesses keep their customers happy and loyal for the long run.

So, a fast INP isn’t just a technical detail; it’s about making the internet a better, more efficient, and more enjoyable place for everyone. It helps businesses succeed by keeping their customers happy and engaged.

How Does INP Work? A Simple Breakdown

To really understand INP, let’s imagine a website interaction like a mini-story with three important parts. When you click, tap, or type, the clock starts ticking. INP measures how long the entire process takes until you see the final result.

Step 1: You Do Something (Input Delay)

This is when you initiate an “interaction.” You might:

• Click a button (like “Learn More” or “Add to Wishlist”).
• Tap on a picture to make it larger.
• Type in a search bar to find something specific.
• Click on a menu item to open it.

The very first part of the INP measurement is called Input Delay. This is the tiny amount of time from when you click your mouse or tap your finger to when the website’s computer code actually *starts* paying attention. Sometimes, the computer is busy doing other things, so there’s a small wait before it can process your action. Imagine you’re calling a friend, and they’re finishing up another chat before they can say “hello.” That little wait is like input delay.

Step 2: The Website Thinks (Processing Time)

Once the website notices your action, it has to “think” about what to do. This is the Processing Time. It’s not really thinking like a human, but its computer code is running behind the scenes. For instance:

• If you clicked “Add to Cart,” the website’s code needs to find the product, check its stock, and update your shopping cart information.
• If you typed in a search bar, the website needs to look through all its pages and products to find results that match what you typed.
• If you clicked to expand a photo, the website needs to fetch the larger image and get it ready to display.

This is where a lot of the work happens. Websites need to be built efficiently so they can process these requests quickly. If the website has too much work to do or its code isn’t very efficient, this step can take a longer time, adding to the overall INP score.

Step 3: The Website Shows You the Change (Presentation Delay)

After all the thinking is done, the website needs to show you the result. This is the Presentation Delay. It’s the time it takes for the website to actually draw the new information on your screen so you can see it. It’s like the artist finishing their painting and then showing it to you. This could be:

• The number next to your shopping cart updating from zero to one.
• A list of search results appearing on the screen.
• The larger image of a product popping up.
• A new part of the menu sliding open.

The “paint” in “Interaction to Next Paint” refers to this moment – when the screen “paints” the new visual elements for you to see. Once you see that visual change, the INP clock stops ticking.

INP measures the total time from your initial click or tap all the way to that final visual change on your screen. A fast INP means these three steps happen almost instantly, making your online experience feel seamless.

What’s a Good INP Score?

Just like in a race, a lower time is better for INP. Here’s how to think about it:

For context, 200 milliseconds is less than a blink of an eye! So, a “good” INP means the website responds faster than you can blink. That’s pretty quick!

The Pieces of the INP Puzzle

We touched on the “Input Delay,” “Processing Time,” and “Presentation Delay” a bit already. Let’s think of them as the three main phases that add up to the total INP time. Understanding these parts helps website builders figure out exactly where they can make their sites faster.

Input Delay: The Waiting Game

This is the very first part of the interaction. It’s the time that passes from when you, the user, initiate an action (like a click or a keypress) to the moment the browser (your internet program like Chrome or Safari) actually starts to process that event. Why would there be a delay here?

• Busy Browser: Sometimes your web browser is already very busy doing other things on the page. It might be loading a big image, running a complex animation, or executing other scripts. If the browser is tied up, it can’t immediately respond to your click.
• Main Thread Blockage: Think of the browser as having one main “chef” (the main thread) doing all the cooking. If that chef is busy chopping a lot of vegetables for one dish, they can’t immediately start on your order for a quick snack. This “chopping” might be a long piece of JavaScript code running.

A long input delay means you clicked, but the website didn’t even acknowledge your click right away. This can be very frustrating because it feels like your action wasn’t registered.

Processing Time: The Brain at Work

Once the browser finally acknowledges your interaction, it then needs to figure out what to do. This is the processing time. This involves:

• Event Handlers: These are pieces of code that “listen” for your actions. When you click a button, the event handler for that button runs. It might be a simple piece of code or a very complex one.
• Data Fetching: Maybe your click needs the website to fetch new information from its server. For example, if you click “Show More Comments,” the website has to ask its main computer (server) for those comments.
• Calculations: If you’re on a calculator website or a shopping cart, your interaction might trigger some calculations, like updating the total price when you add an item.

This phase is all about the website’s inner workings. If the code is inefficient, or if it has to do a lot of complex tasks, this part of the INP can take a long time. It’s like the kitchen trying to cook a very complicated meal when you just ordered a simple sandwich.

Presentation Delay: Showing the Results

After the website has figured out what to do (the processing time), it needs to show you the result on your screen. This is the presentation delay. It involves:

• Layout: The browser calculates where all the elements on the page should go. If new items are added, or existing items move, the browser has to rearrange everything.
• Painting: The browser then “paints” or draws these elements onto your screen. This includes colors, text, images, and any other visual changes.
• Rendering: This is the final step where the new, updated look of the page is displayed for you to see.

Even if the first two steps are fast, a website can still feel slow if it takes a long time to draw the changes on the screen. For example, if you click to filter products, the website might know which products to show very quickly, but if redrawing the entire list of products takes a long time, you’ll still experience a delay.

Understanding these three pieces helps website developers pinpoint exactly where the slowdowns are happening. Is the website slow to notice your click, slow to think about it, or slow to show you the results? By fixing the slowest part, they can improve the overall INP score and make the website feel much faster and more responsive for everyone.

Common Things That Slow Down INP

Just like a busy road can slow down traffic, certain things can make a website’s INP score higher (which means slower). Website creators try their best to avoid these issues. Here are some common culprits:

• Too Much JavaScript: JavaScript is like the magic behind many interactive features on a website, like pop-up menus, image slideshows, or even making buttons change color when you hover over them. But if a website uses too much JavaScript, or if the JavaScript code isn’t written efficiently, it can make the browser very busy. Imagine too many people trying to talk at once – nothing gets heard clearly. This can lead to long input delays and processing times.
• Big Images or Videos: High-quality images and videos look great, but if they are too large in file size, they can take a long time to load. While the browser is busy downloading and displaying these big files, it might struggle to respond quickly to your clicks. It’s like trying to carry too many heavy bags at once – you move much slower. Optimizing visual user-generated content is key here.
• Complex Page Layouts and Animations: Some websites have very fancy designs with lots of moving parts, animations, or detailed graphics. While these can look cool, they can also require a lot of effort from your computer’s graphics card to draw and redraw. If the computer is constantly busy rendering complex animations, it might delay showing you the result of your interaction.
• Slow Server Response: The server is like the website’s main brain or library, where all the information is stored. When you click something that needs new information (like loading more products), your browser sends a request to the server. If the server is slow to respond, or if it’s located very far away, that delay adds to the overall INP. It’s like asking a question and waiting a long time for the answer.
• Fonts and Other Resources: Websites often use special fonts or other resources that need to be downloaded. If these are large or numerous, they can also keep the browser busy and delay its ability to respond to your actions.

Website developers are always looking for ways to reduce these slowdowns, because they know that a fast and responsive website makes users happy and keeps them coming back for more online adventures.

How Can Websites Improve Their INP?

Making a website faster and more responsive is a bit like tuning up a car – there are many parts to check and improve. Here’s what website builders do to get a great INP score:

• Optimize JavaScript: This is a big one! Developers try to make their JavaScript code as small and efficient as possible. They might break up long tasks into smaller ones so the browser doesn’t get stuck doing one thing for too long. They also make sure JavaScript only runs when it’s truly needed. Think of it like a chef prepping ingredients in small batches so they’re always ready, rather than trying to chop everything at once.
• Compress Images and Videos: Websites can use tools to make image and video files smaller without losing too much quality. This means they download faster and the browser can display them more quickly. It’s like packing your suitcase efficiently so it’s lighter and easier to carry. This is especially important for visual user-generated content like customer photos, which can be numerous but still need to load quickly.
• Pre-load Important Stuff: Sometimes, website developers can guess what you might click or need next and start loading it in the background before you even ask for it. This makes the response feel instant when you finally do click. It’s like your favorite show streaming a little bit ahead so you don’t have to wait for buffering.
• Use Fast Servers: Just like a powerful computer runs programs faster, a powerful and well-located server can respond to website requests more quickly. Many businesses use what’s called a Content Delivery Network (CDN), which stores copies of the website closer to where users are, reducing the distance information has to travel.
• Prioritize What Users See First: Developers make sure that the most important parts of a page – the things you see and interact with right away – load first. Less important things can load a little later. This ensures that the parts you care about most are always snappy.
• Minimize Complex Animations and Styles: While animations can be fun, too many or overly complex ones can slow down how quickly the browser draws things. Developers try to keep animations smooth and efficient so they don’t delay the important visual feedback from your interactions.
• Efficiently Integrate Third-Party Tools: Many websites use tools from other companies, like for customer reviews or loyalty programs. It’s important that these tools are integrated in a way that doesn’t slow down the website. For example, Yotpo Reviews and Yotpo Loyalty are designed to load and function efficiently, ensuring they enhance the user experience without negatively impacting INP.

By constantly checking and improving these areas, website teams work hard to make sure their sites are as fast and responsive as possible, creating a delightful experience for everyone who visits.

INP and Your Online Shopping Experience

Think about your favorite online store. What makes it a great place to shop? Sure, good products and fair prices are important, but how the website feels and responds is also a huge part of it. This is where INP really shines in the world of online shopping.

When you’re browsing an online store, you’re constantly interacting with it. You might be:

• Clicking on different product categories to explore.
• Tapping on a product image to see more details or a bigger picture.
• Typing into the search bar to find a specific item.
• Adding items to your shopping cart.
• Clicking “checkout” to complete your purchase.

In every one of these moments, a good INP score means the website responds instantly. You click on a product, and the page changes without a stutter. You add to cart, and the cart icon updates immediately. This instant feedback creates a seamless and enjoyable shopping journey. It makes you feel like the website is working with you, not against you.

If the INP is poor, however, these interactions become frustrating. You click “add to cart,” and for a few seconds, nothing happens. Did it work? Should you click again? This kind of uncertainty can make shoppers abandon their carts and leave the website entirely. It directly impacts the ecommerce customer experience. A happy customer is more likely to buy and return, while a frustrated one will simply go elsewhere.

Tools like Yotpo’s Reviews and Loyalty programs are crucial for online stores, but they must also be designed to maintain a fast experience. For instance, when customers view ecommerce product reviews, the review sections and star ratings need to load quickly without slowing down other interactions on the product page. Yotpo’s solutions are built to integrate smoothly and efficiently, ensuring that valuable content like customer testimonials and loyalty program features enhance the shopping experience without creating delays that would hurt INP. This thoughtful design helps online businesses provide a complete, engaging, and fast experience that keeps customers coming back, contributing to long-term ecommerce retention.

Ultimately, a fast INP for an online store means less friction, more joy, and a higher chance that you’ll find what you’re looking for and complete your purchase happily.

INP and Google’s Core Web Vitals

You might have heard that Google cares a lot about how good websites are for people to use. They even have special measurements called “Core Web Vitals” that help them figure this out. These vitals are like a report card for how user-friendly a website is, especially when it comes to speed and responsiveness.

For a long time, one of these important measurements was called First Input Delay, or FID. FID measured how quickly the website started to respond to your *first* interaction. It was a good start, but it didn’t tell the whole story. Imagine someone asking you a question, and you immediately say “hmm…”, but then you take a very long time to actually give them an answer. FID only measured the “hmm…” part.

This is where INP comes in and why it’s so important! Google has now made INP one of its main Core Web Vitals, and it’s taking over from FID. Why is INP better? Because INP measures the *entire* interaction, from your click or tap all the way until you see the visual change on your screen. It’s like measuring not just how quickly you say “hmm…” but how quickly you give the full answer and show what you’re doing. This gives a much more complete and accurate picture of how responsive a website truly feels.

Why does Google care so much about INP and other Core Web Vitals?

• Better Search Results: Google wants to recommend the best websites to people who are searching. Websites that are fast, stable, and responsive (meaning they have good Core Web Vitals, including INP) are generally considered better quality. So, having good scores can help a website show up higher in Google’s search results, making it easier for people to find.
• Improved User Experience: Google knows that if people have a frustrating experience on a website, they’ll just go somewhere else. By encouraging website owners to improve their Core Web Vitals, Google helps make the entire internet a more pleasant place for everyone.

So, when a website owner works on improving their INP, they’re not just making their visitors happier; they’re also making Google happy, which can lead to more people discovering their site. It’s a win-win for everyone!

Yotpo’s Role in a Responsive Website Experience

As we’ve explored, a super-fast and responsive website is key to keeping visitors happy, especially when it comes to online shopping. While Yotpo focuses on helping brands build strong relationships with their customers through reviews and loyalty programs, these solutions are always built with website performance in mind. They contribute to a smooth website experience that aligns with what a good INP score represents.

Yotpo Reviews: Engaging Without Delay

Imagine you’re on an online store, looking at a cool new toy. Before you buy, you want to see what other kids (or grown-ups!) thought of it. You scroll down to the customer reviews section. If this section takes a long time to load, or if clicking on a star rating filter makes the whole page freeze, that’s not a great experience. This kind of delay would contribute to a poor INP score.

Yotpo Reviews is designed to display valuable user-generated content like ratings, written reviews, and customer photos in a way that loads efficiently. This means that when you’re interacting with these review widgets – scrolling through opinions, clicking to read more, or sorting by highest rating – those interactions should feel quick and responsive. Yotpo understands that seeing authentic customer feedback is crucial for consumer decision-making, and it provides tools to help businesses gather customer reviews and display them effectively without slowing down the rest of the website.

For example, if you visit an online store powered by Yotpo’s product reviews app for Shopify, you’ll find that the integration is designed to be lightweight, allowing other important interactions on the page to remain snappy. This attention to detail helps create an excellent overall eCommerce customer experience, which a good INP score is all about.

Yotpo Loyalty: Seamless Rewards Experience

What if you’re a returning customer, eager to check your loyalty points or redeem a special reward? When you click on a loyalty program widget or a “My Rewards” button, you expect it to open instantly and show you your points balance without any delay. Just like with reviews, a slow response here would be a noticeable interaction delay, impacting INP.

Yotpo Loyalty helps businesses create exciting loyalty programs that encourage customers to keep coming back. These programs, from showing your points to offering unique rewards, are integrated into the website with a focus on smooth performance. This ensures that customers can easily interact with their loyalty rewards program software without experiencing frustrating slowdowns. A fast and responsive loyalty experience makes customers feel valued and engaged, which is essential for building strong relationships.

By designing both Reviews and Loyalty solutions to be efficient and fast, Yotpo helps businesses provide a better ecommerce customer experience. A website that responds quickly and smoothly, even with rich content like reviews and loyalty features, creates a much happier customer. Happy customers are more likely to spend more, return often, and even tell their friends about their great experience – essentially becoming valuable word-of-mouth marketing for the brand. This overall positive impression, where interactions feel instant and satisfying, directly supports the goals that a good INP score aims to achieve for any website.

Putting It All Together: The Big Picture

So, we’ve gone on a journey to understand INP, or Interaction to Next Paint. It might sound like a technical term, but at its heart, it’s about something very simple and very important: how quickly a website responds to your actions.

Think of INP as the website’s responsiveness meter. When you click, tap, or type, a good INP score means the website acknowledges your action and shows you the result almost instantly. It’s the difference between a website that feels like it’s reading your mind and one that feels like it’s stuck in slow motion.

A low INP score is a sign of a healthy, user-friendly website. It means:

• For You, the Visitor: A smooth, enjoyable, and frustration-free online experience. You feel in control, and the website feels reliable.
• For Businesses with Websites: Happier customers, more sales, better rankings in search engines like Google, and stronger customer relationships. It helps them build a successful online presence, making sure that every interaction, from browsing products to engaging with customer reviews or loyalty programs, is a positive one.

Website developers and designers work hard behind the scenes to make sure websites are built efficiently, making sure JavaScript runs smoothly, images load quickly, and servers respond fast. They understand that every little delay can add up and impact how you feel about a site.

Now that you know what INP is, you can appreciate all the effort that goes into making your favorite online spots feel so fast and seamless. It’s all part of making the internet a more wonderful place to explore!