2.26. Load
It is impossible to determine in advance how many concurrent visitors your site can handle. It all depends on many factors: the quality of the site code optimization, its massiveness, the nature of the actions performed by site visitors, etc. To check the load, you can toorder hosting for a free trial period, place a website on it and study the load graphs after a while.
To determine the load on the server, study and analyze problems, you can use Charts and load data on webserver and MySQL server .