What is unused JavaScript?

What is unused JavaScript?

Overview. Reducing unused JavaScript can reduce render-blocking behaviour to speed up your page load and improve your visitors’ page experience. By default, JavaScript files are render-blocking because they block the browser from dealing with other page load tasks, thus delaying your page’s First Paint.

How do I remove unused JavaScript from Shopify?

Remove unused CSS and unused JS:

1. Check assets folder of the theme and remove unused CSS and JS file.
2. Check and remove unused apps.
3. If your store has not install any app you can comment {{ content_for_header }} code in theme. liquid (not recommended if you don’t have a knowledge about the liquid)

How do I remove unused CSS from my website?

How to remove unused CSS manually

1. Open Chrome DevTools.
2. Open the command menu with: cmd + shift + p.
3. Type in “Coverage” and click on the “Show Coverage” option.
4. Select a CSS file from the Coverage tab which will open the file up in the Sources tab.

How do I remove unwanted code Shopify?

The following are the steps that you can follow to remove unused codes or files from your Shopify store.

1. Scan through your theme. liquid file.
2. Check if the file came from an app or not.
3. Check if the app is installed in the store.
4. Remove the code & file.
5. Check if the changes you made caused an error.

How to reduce bytes consumed by network activity?

Remove unused JavaScript to reduce bytes consumed by network activity this note is new after some updates from google PageSpeed Insights. This opportunities is showing when you try to test your website speed in google page speed , as page speed insights these suggestions can help your page load faster.

How can I get rid of unused JavaScript?

Removing unused code can make your pages faster load and save your mobile users cellular internet data. On this link you will find step by step how to find and remove unused JavaScript code with the coverage tab in google chrome Development tools.

Is it bad to send unused JavaScript over network?

Even if the JavaScript is asynchronous (i.e. not render-blocking), the code competes for bandwidth with other resources while it’s downloading, which has significant performance implications. Sending unused code over the network is also wasteful for mobile users who don’t have unlimited data plans.

How many kibibytes of unused JavaScript are there?

Sending unused code over the network is also wasteful for mobile users who don’t have unlimited data plans. Lighthouse flags every JavaScript file with more than 20 kibibytes of unused code: