How to avoid loading irrelevant JS files in Shopify in 2025?

[mfcss]

I periodically try to optimize our Lighthouse page speed score and previously managed 90+ scores for all our pages. Since then, however, Shopify has introduced a ton of new JS/CSS files that load and seem to reduce all our page scores to the 60-70 level.

See e.g. the below screenshot of a number of JS files that are completely irrelevant to us (we e.g. do not use Prime, Google Pay, Rage Click and whatever all the other stuff is):

In addition, I could previously use a liquid script ala below to remove JS files from loading on e.g. my non-product pages - but this no longer seems to work, as if Shopify potentially removed the ability to capture the content header at all. Anyone who has found a work around?

{% capture h_content %}
{{ content_for_header }}
{% endcapture %}

{{ h_content | replace: '\/\/d1liekpayvooaz.cloudfront.net\/apps\/customizery\/customizery.js?shop=xyz.myshopify.com', ''}}

[EstherBui]

Hi Mfcss

The JS files are loaded according to each theme's setup. However, the score on Lighthouse may not fully reflect the store's actual speed. Generally, a store only needs a score of 50 on mobile and 80 on desktop for good performance.

In my opinion, you should minimize the use of third-party apps, avoid putting too much content on a single page, and refrain from using external libraries like jQuery. This will help ensure the store has the best possible speed.

Best, 
Esther