if you are facing a slow site then it can be the reason that you are using slow hosting may be shared hosting. you need to host decent hosting that provides perfect speed with a high uptime ratio this will definitely help in your loading speed. and some other reasons are Your image sizes are not optimized you have to optimize them properly because mages represent 50% of the loading time of a website. also if You’re using a bad theme then it will also affect your website loading time these are some points that indicate your slow site facing issues.
Added (2022-10-17, 10:57 AM)
if you are facing a slow website speed for your e-commerce website then it can cause many problems. there are several reasons for facing slow website issues. maybe your web hosting is shared hosting that doesn't support high traffic and Page speed measures the time it takes the content on a URL to load Improve. Your Ecommerce Site Performance & Speed needs some more advanced features web server like a Virtual Private server. it can help to gain high traffic easily but not only web hosting matters here are some points that indicate how you can improve your website speed:-
01. Use fast and reliable hosting
02. Use a content delivery network (CDN)
03. Organize your tracking with Google Tag Manager
04. Unblock the browser from parser-blocking scripts
05. Prioritize testing to optimize your mobile performance