Wix.com Needs To Catch Up With The Times

I believe that Wix's features and optimization are inadequate. No matter what I do, the site speed is incredibly slow, and whenever I add a new element, the site practically freezes. The desired filtering feature in the product sales section also doesn't work properly. For example, when you select a size and click on a product, you see that the size you selected is out of stock, and the filtering function doesn't fulfill its purpose. When I wrote to customer service, they said that the system works that way. The main problem is not related to the money I spent. The integration app I use only allows for a single platform, and I trusted Wix and chose this platform. At this point, even if I want to have a website made from another platform, I can't switch.