These are part of the Squarespace's 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:
Squarespace 7.1 can appear faster for visitors than Squarespace 7.0 (although it is currently slower on the back-end where you configure it)
Squarespace 7.0 Brine-family sites have a feature called Ajax Loading which improves performance over 7.0 templates without 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 Index pages.
Use JPEG (.jpg) images where possible (but PNGs for logos). Limit the number of GIFs.
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
So basically what are you saying is switch platforms if you want a website that performs better. 🙂
Performance improvement - Render blocking and unused Java script help
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So basically what are you saying is switch platforms if you want a website that performs better. 🙂