Re: [Zope] When does http reponse begin to be sent.

There is however a riding caveat: Web users are trained to be able to do something with partial data, to be able to act _before_ the entire page has been rendered. In the IBM world above, the base assumption was that nothing could be done until the entire data set (the "frame") had been received.

Exactly. I was speaking specifically of the web world, where all kinds of research has shown that simply including image size attributes in your <img> tags causes speed perception to be dramatically improved, since the browser can render the document before the images even begin to download. I myself frequently click through to another page long before a page has completed loading, partcularly if it is going slow. --sam