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I don’t always agree with him, but these are helpful guidelines for web page response times: Response Times: The Three Important Limits.

At work we’ve been building on a web application (a phrase Nielson doesn’t like) for over a year and we’ve been trying to reduce the loadtime of a particular page—it’s a page showing, for lack of a better description, a lot of information. Previously it took close to 8 seconds to load the page. Now we’re down to about 2-3 seconds depending on the browser.

One day it’ll be 0.0001 seconds. Mwa-ha-ha.