Has performance improved?

Hi All,
I spent three months in learning & implementing this wonderful tool in my organization. I recorded the scripts for two different builds (A and B) using TCPProxy, modified according to my requirements, ran it and collected the two different logs. The dev team has made lots of changes in the application to improve the performance of our application (which is build B). Now, the dev along with the higher management wants to know whether the application performance has actually improved or not. I proposed the following method which got rejected
     * Add the average mean time of all requests for each page for both builds A & B and compare them. They rejected this outright saying the builds (A & B) may vary with the number of requests in each page.  And since I do a sum of the average mean time of all the requests in a page, the load time will definitely be higher for the page having higher requests. (These requests are actually resource files which in real browser will be loaded in parallel). 

I'm now in a position where I really could not explain to them whether the performance has actually improved or not.
Would really appreciate if someone can guide me on this
Regards,Chandiran

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