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I have a web app that I am trying to speed up. It looks like this: +------+ | | | | +------+ +------+ | | | | +------+ +------+ | | | | +------+ Each box is an iFrame containing a Flash SWF and some javascript. The SWF downloads a thirdparty SWF that is used to display information. I have found that the load time for the webapp is: LoadTime = (4 seconds) * numberOfBoxes + (3 seconds) When I just imbed the 3rd party swf directly (without our swf or the javascript) the load time is: LoadTime = (1 second) * numberOfBoxes + (2.5 seconds) I am trying to find where the extra 3 seconds is being used so that I can speed up our webapp. I think that the candidates are: Serverside processing (jsp) Download Javascript Flash Other? Download Below is an image of the downloads taken from firebug. I have replaced the file names with what their type is. None of the downloads are taking especially long after the first time . One place of interest however is marked in red. The red area is a 3 second gap between when My SWF is loaded and when two gif files are loaded followed by the Third Party SWF . I think this pause is caused by processing on the client (is this true?). Note: The red bars in the graph are not part of the diagram. I added them to highlight the gap where nothing is occurring on the .net panel . I think that I can conclude from this that I have a client side processing issue which implies either Flash or Javascript. Question 1: Is this correct? Edit: I added up the total non-concurrent download time: When there is 1 iframes the download time is 1

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