I found that sometimes my website is slow, and I suspect that this is the web host's problem. But the web host insists on that the website is fast. The problem, I suspect, is that the website is fast sometimes, and slow most of the time. The people at web host would just measure the load time of a webpage when the page is responding fast and tell me that there is no problem at their end.
So, I am thinking about capture the load time for every webpage request, I am not sure whether is this information already available in cpanel ( I am using cpanel)? If yes, how can I get it?