Hi there.
Thank you for your feedback.
Although SEMRush is a great tool, keep in mind that Wix sites have a unique structure and some external tools will not provide an accurate reading of our framework, which is why we recommend using Wix Turbo for site speed insights.
We work closely with Google especially (as well as other search engines) to optimize best within our unique structure, so it’s important to note that domain connected Wix sites are not considered spam for Google.
Performance improvements have and will always be a prioritized focus here at Wix. Again, thank you for your feedback. I will be forwarding it to the designated team.