Check Your Squarespace Site Speed
Run a Lighthouse audit on your Squarespace site and export the full JSON report. Squarespace controls most of the platform code, but these reports show which parts of your design and content choices are hurting your Core Web Vitals.
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Loading...Common performance issues on Squarespace sites
These are the issues most frequently found in Squarespace Lighthouse audits. Your report will tell you exactly which ones apply to your site.
Heavy Squarespace platform JavaScript
Squarespace loads a substantial JavaScript framework on every page. This is platform-level TBT that you cannot fully eliminate, but you can avoid stacking more scripts on top of it.
Large hero background images
Full-screen banner sections are a Squarespace staple but are a major LCP bottleneck if the image is large and uncompressed. Squarespace does not always optimize hero images automatically.
Custom code blocks adding render-blocking scripts
Third-party scripts (booking widgets, chat, marketing pixels) added via Code Injection are loaded synchronously in the <head> and block all rendering.
Fonts from multiple sources
Squarespace sites often load fonts from both Squarespace's CDN and Google Fonts simultaneously, each requiring a separate connection and blocking text rendering.
Pro tip: Squarespace allows custom code injection — add <link rel="preload" as="image"> for your most important above-the-fold image in the <head> injection area to markedly improve LCP with a single line of HTML.