Response Time on a web page like a stop watch

I have searched and found so many answers but nothing that fits my requirement. I will try to explain here and see if any of you guys have some tips.

• I wish to click on a link manually and from there on; I wish that some kind of tool or service starts recording time from my click and stops when the desired page is loaded. This way, I am able to find out the exact user interface response time.

• All the online web testing services ask for main URL. In my case the main URL has gazillion links and I wish to use only 1 link as standard sample which is a dynamic link

For example: - I click on my friend's name on Facebook - From my click to the time page is loaded, if there's a tool that does the stop watch thing?

End goal is:

I will be stress testing a server with extensive load and client wishes to see response time of simple random pages when load is at 500, 1000, 2000 and so on.

Please help!

Thank you.