You need to profile your application to see your resource utilization at a given rate. From there you can estimate. There are other factors involved with tryin

You need to profile your application to see your resource utilization at a given rate. From there you can estimate. There are other factors involved with trying to look at a site and guess their optimizations. Perhaps they're using a CDN to distribute their assets so the actual website has a quite low load? Maybe there's an inefficient algorithm that's burning through CPU and they haven't optimized it yet because they're working on another new feature. In the mean time, they're paying for extra CPU time instead of paying for engineer time.