geoff.dunkak

These are part of the Squarespace custom CMS platform and you cannot remove them.
Bear in mind that these tools are designed for developers who code their sites from scratch and have full control over their code and styles. When you use these tools to test Squarespace sites you'll see results that are not relevant to you.
Things worth considering when trying to increase site performance include:
Don't add custom code that you find on forums, without understanding how it works and how it will slow down your site. In particular, try to avoid adding any code that includes a '$' character as this denotes it relies on a comparatively large code library called jQuery that must be downloaded by your visitors, slowing down your site unnecessarily. Don't add third party trackers or pixels, like AddThis, GTM, LinkedIn and so on. These can really slow down your site's loading times. Use Squarespace 7.1 in preference to 7.0. Squarespace 7.1 can appear faster for visitors than Squarespace 7.0 and is constantly being improved. If you are planning to use Squarespace 7.0, use a Brine-family template. Brine-family based sites have a feature called Ajax Loading which improves performance over other 7.0 templates that don't have this feature. Keep image sizes low. Ideally, images should be less than 500KB in size, with a width of 1500px or 2500px. Keep galleries small. Ideally, limit them to 50 images each.  Keep Banner Slideshows small (less than 10 images), especially on 7.0 Index pages and 7.1 pages with multiple sections. Limit the number of Blocks on one page to 60. Use JPEG (.jpg) images where possible (but PNGs for logos). Limit the number of GIFs. Don't heavily compress JPEG images before adding them or their file size may increase after Squarespace processes them  Avoid embedding content where possible. Don't embed content or libraries unless they are essential. Reduce the number of fonts. Fonts must all load behind the scenes before the page can appear in the browser. -Paul
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This topic can be confusing, so let me try to clarify.
I'm not saying that Squarespace performance cannot be improved. Performance can always be improved, regardless of the platform, but in reply to the original question, I'm simply explaining that there is nothing that you or I - or any third party specialist - can do to reduce "unused" or render-blocking JavaScript on Squarespace.
Only Squarespace's Web Performance team can improve the backend code. They've already made significant progress to ensure Squarespace sites compete well and there is more to follow. Where possible, they have removed render-blocking Javascript and are lazy-loading images across websites.
If you're using version  7.0 (or planning to use it) then it's worth bearing in mind that not all of the improvements being made will benefit version 7.0 sites. If you are looking for higher performance, version 7.1 is likely to show better CWVs over time in comparison.
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