Using Ryviu will not affect your store's loading speed. Ryviu is designed with performance in mind and uses a content delivery network (CDN) to deliver scripts and images, allowing widgets to load in under a second.
Additionally, Ryviu will only start loading after the product page has fully loaded, including all scripts and images. This means that Ryviu cannot slow down your store's loading speed.
If you want to check the load speed of your store, there are many online tools available such as PageSpeed Insights and GTmetrix.
If you have any questions, don't hesitate to ask us for assistance.