Why Your Squarespace PageSpeed Score Is Low (Images Are Almost Always the Reason)
You ran PageSpeed Insights and the number was bad
You opened Google PageSpeed Insights, typed in your Squarespace URL, and got a score somewhere in the 30s, 40s, or 50s. Now you are staring at a list of recommendations that look like they require a developer and three weeks of work.
Good news: most of them do not apply to you. And the one that does is almost certainly images.
How to read a Squarespace PageSpeed score correctly
PageSpeed Insights has a known issue with platform-built websites: it flags the platform's own code as a problem you need to fix. On Squarespace, you will almost always see warnings like "Reduce unused JavaScript" or "Eliminate render-blocking resources." These refer to Squarespace's core code, which you cannot change. Ignore them.
What you should focus on is the Field Data section, not the Lab Data score at the top. Field Data shows how real visitors experience your site. If your Core Web Vitals pass in Field Data, your site is fast enough for Google's ranking purposes regardless of the top-line score.
The metric that matters most is Largest Contentful Paint (LCP). This measures how long it takes for the largest visible element on the page to load. On almost every Squarespace site, that element is an image. Specifically, it is your hero image or the first large image a visitor sees.
Why images fail LCP on Squarespace
Squarespace does some image optimization automatically. It resizes images to multiple widths and serves them via a global CDN. What it cannot fix is the original file you uploaded being 4 MB when it should be 250 KB.
Even after Squarespace resizes your image to the right width, a massive original file produces a massive resized version. A 5 MB hero image uploaded from a phone might become a 1.5 MB version served at desktop width. That is still 6 times larger than it needs to be.
The result: your LCP takes 4 or 5 seconds on mobile. Google sees that. Your score suffers. Your rankings suffer.
The fix is simpler than the score makes it look
Get every image on your site under 250 KB. That single change has more impact on your Squarespace PageSpeed score than anything else you can do without touching the platform code.
The traditional way to do this is to download each image, compress it in TinyPNG or Squoosh, and re-upload it. For a site with 50 or more images, that process is not realistic.
SquareOptimizer is a browser extension that scans your entire Squarespace site and compresses every image in one session, directly in your browser. No downloading. No re-uploading. No repositioning. Your pages stay exactly as they are, images just get smaller.
Scan your site for free, see what your current image sizes look like, and then optimize your Squarespace images in one click. You get 10 free optimizations to start.
After you optimize, test again
Once your images are compressed, run PageSpeed Insights again. In most cases, LCP improves significantly. For sites with very large hero images or product pages with many high-res photos, the improvement can be dramatic. A site that scored 38 before can often reach 70 or above after image optimization alone.
It is the single highest-impact change available to a Squarespace site owner that does not require a developer.
