Can Anyone Please guide me about my Website Blue Astral load time

One of our client came up with the performance issue(loading time is high) specifically at CMS Admin side.Can you please suggest what all aspect I can check to make sure better performance or reduc...

I uploaded a Kentico website on a shared server. When for the first time I visit the website it takes long time to load that I think it is because the engine needs to make the website. After the fi...