Does not use passive listeners to improve scrolling performance

[ia-gaurav]

Preconditions :

Magento 2.4 latest version

Steps 1: Check you site via google page speed :https://developers.google.com/speed/pagespeed/insights
Steps 2: Check audit report you will see below issues
Does not use passive listeners to improve scrolling performance
Consider marking your touch and wheel event listeners as passive to improve your page's scroll performance. Learn more.
Source
…en_US/jquery.min.js:313:558

Can it be fixed are it is causing issue with mobile perfomace

[m2-assistant]

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[mrtuvn]

the fix maybe take times even a years to deploy/merge into codebase
i think you can workarounds and patch with your own way
https://stackoverflow.com/questions/60357083/does-not-use-passive-listeners-to-improve-scrolling-performance-lighthouse-repo
Add web/jquery.js to your theme instead modify core. Add some patch at bottom

[Quazz]

Personally I've been using the following patch on jquery for ages:

require(['jquery'], function(jQuery) {
    'use strict';
    (function() {
        jQuery.event.special.touchstart = {
            setup: function(_, ns, handle) {
                this.addEventListener('touchstart', handle, {passive: ns.includes('noPreventDefault') ? true : false});
            }
        };
        jQuery.event.special.touchmove = {
            setup: function(_, ns, handle) {
                this.addEventListener('touchmove', handle, {passive: ns.includes('noPreventDefault') ? true : false});
            }
        };
    }());
});

[mrtuvn]

Add to the file lib/web/jquery/patches/jquery.js

[mrtuvn]

Created pr for jquery newer version here
#34162

@ia-gaurav See my link above

[ia-gaurav]

@mrtuvn - can u tell what to add in lib/web/jquery/patches/jquery.js

[nkajic]

https://gist.github.com/nkajic/727ae5ff874894f96356b44eece9fd6a

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[engcom-Hotel]

@magento give me 2.4-develop instance

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Hi @engcom-Hotel. Thank you for your request. I'm working on Magento instance for you.

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Hi @engcom-Hotel, here is your Magento Instance: https://6dd90eea1a8e2a0fc4db3ee65e365b93-2-4-develop.instances.magento-community.engineering
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[engcom-Hotel]

@magento give me 2.4-develop instance