There are indeed some problems with the score on the dashboard.
I checked the speed of your website with Google Page Speed Insights and GT Metrix and it is pretty fast.
Your Speed Score is about average. We typically see this score range between 10-30. Your score is derived from the same engine that Google Page Speed Insights uses (Lighthouse). It's kind of misleading, but your Speed Score isn't actually a good indicator of how fast your site is. It takes many other factors into consideration beyond just speed before giving you a score.
We actually just published an article that talks about various speed tools and how useful they are in relation to your Shopify site: Understanding Load Speed + Analysis Tools and Scoring on Shopify
I went ahead and ran your homepage through the Shopify Analyzer. It's a free analysis tool our team built for the community. It looks like you could benefit from converting the formats of any images with a non-transparent background from PNG to JPG. PNG images tend to be larger files, which increases page weight. Here's your full report if you'd like to take a look: https://analyze.speedboostr.com/result/g11wxeflgh.
Beyond that, it looks like your site is performing pretty well. If you have any more questions or need help with your site, feel free to reach out to our optimization team at speedboostr.com/contact