Although Shift4Shop performance is great, due to the theme and design choices made, the website may not meet the thresholds for Core Web Vitals (CWV) metrics. CWV metrics are essential for ensuring a positive user experience, and websites that don't meet the standards set by Google may see a negative impact on their search rankings. Fixing CWV issues on your Shift4Shop website can help improve loading times, make the site more responsive, and create a more stable layout, all of which can lead to a better user experience and higher search rankings.