I have put custom timers around each image on a page to get the response times for them. There are two things I have noticed that I am hoping someone will have an explanation for.
First, sometimes the response time is 0.00. Is this correct? Is the image downloading so fast that it doesn't register a response time? I would think that every image would take at least a couple ms.
Second, when an image does get a response time they seem to always return only a couple numbers. For instance, I have timers around 15 graphics on a page. The numbers returned (when not 0) are always .015 seconds or .016 seconds. I would think there would be a greater span of times than just these two results. Anyone experience this before?
What I understood is, you have a webpage which contain lot of images.You are trying to claculate time taken for downlaoding each image in that page. By default the web browser downloads images and other files of the webpage simultaneously using multiple threads. So u need to change your web browser emulation settings to "Single threaded".This will ensure u that images will be downloaded one by one and the calculated times will be acurate. I think this is the reason why u are getting zero values.
How to set the threading option...?
Right click on active profile then choose edit profile then click on "Web" section of "Replay" tab. Then click on "Browser" tab. U will see a check box "Single- threaded".
Please ignore this if u aware of setting threading option.