What Is First Input Delay and How To Fix It

What is the first input delay, how does it work in core web vitals? How to fix this problem to improve the performance of your website.

The first input delay is a user experience when the user clicks on your website and then after loading all the content and images of your website. The user clicks on any link, then after clicking on your link how your website works that is the first input delay.

Today you will learn how to fix this first input delay error and how to check in tools to improve this performance.

What is First Input Delay

Let us discuss this first input delay using an example so that you can easily understand it.

Just think that you are in the forest and a tiger comes in front of you, what will you do now? Your mind will freeze for some time. Then after a few seconds, your brain will work. Hey, Tiger is coming here, run away from here soon.

Now when you see the tiger and run after seeing the tiger. The time between you seeing the tiger and running away from that place, that time is the first input delay.

How First Input Delay (FID) Works

When your visitor visits your site and after loading all content of your site he will click on some link or element. FID is not that time when the action occurs after clicking the button. FID is the time when the site starts working after clicking on the button.

So FID means how long it takes to register user touch, tap, or click and how that click is taking action on that.

How First Input Delay (FID) Works

Google notes your FID score in milliseconds. If your FID score is in 100ms then it is good. If your FID is 300ms then you need to improve it but if your FID score is 300ms higher then it will show poor performance.

You cannot see your website FID score in page speed insight or any other tool. Google notes your FID score using field data means that it collects data from live users when they click on a link.

Total Blocking time(TBT)

You can check your FID score using TBT. If your TBT score is good, then your FID score is also good.

How Improve Your TBT Score

When you work on improving the TBT score, your FID will also be fixed.

  • Reduce JavaScript Execution Time
  • Optimize CSS
  • Minimize Main Thread Work
  • Reduce Third Party Code
Reduce JavaScript Execution Time

Your site will not respond until all the JavaScript on a page is loaded. So use as much JavaScript as required. Minify or delete unused JavaScript. We already discussed in the last LCP blog how to minify JavaScript.

Optimize CSS

There are many CSS files in our website, which is unnecessary, which makes no sense, then minify all CSS.

Minimize Main Thread work

When the browser loads your website, the backend loads a lot of processes that are stuck in a lot of threads, one of them is the main thread which works more like creating DOM, executing JavaScript, etc.

The browser will not allow the user to input for as long as it remains busy. You will also find a way to solve this in Page Speed Insight.

Minimize main thread work

In this image, you can see how much time the main thread is taking.

Reduce Third Party Code

Third-party code is code that comes from outside in your website like google analytics, chat using this website, they will add some dynamic code to your website.

All these things increase the time of your website. To make it work, you use the third-party code that is required for you.

If your competitor is using a third-party tool, it does not mean that you should also use it. Use only if you need this functionality.

So this FID is a little bit up down metric but if you work on all these things then your FID score will get better.

Important Point 

When a visitor visits your website, the browser first loads all the content from the bottom of your website and then slowly loads the top part but the visitor wants to read the top part first.

When your website loads it completely using any browser it loads the first bottom section of your website then the top part but the user needs the top part first.

For this, you can tell your developer to save the upper part in a separate folder and save the lower part in a different folder so that when someone opens your site, the top part is visible to the visitor first. By the time he reads the top part, the lower part will be loaded automatically.

If anyone visits your website, it starts reading from higher than and doesn’t run down right away and if you’re saving and loading the highest part of your website in an exceedingly separate folder, then there’s no downside with loading speed before the user can return and also the loading speed and performance of your web site can stay sensible.

Conclusion :

Google recently updated its Corel Web Vital to improve its CLS, FID, and LCP scores and improve your mobile performance.

If you have worked on the following point then you can easily fix your first input delay. I hope you guys have understood this blog post. If you like this post, you can share it with your friends.

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