Monitor resources for a particular page


I have created a new application that will be used in-house but run from my VPS. I want my application to reload the page regularly, but I don't want to overload my VPS with it. Is there a way for me to do some page loads and accurately monitor the resources it uses on my VPS to calculate how often I want it to refresh?
Thanks for the direction. That seems to be what I am looking for. What I'm worried about isn't on that page, so that's a good sign! Will keep an eye on it.

Thanks again,