architectural considerations for high traffic web portals

Can anyone tell me a开发者_JS百科bout the architectural considerations for high traffic web applications?

Links to any articles would be helpful.

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Useful Links

Best scaling methodologies for a highly traffic web application?

https://serverfault.com/questions/80821/expecting-high-traffic-on-website-how-to-manage

http://highscalability.com/plentyoffish-architecture

This guide is useful for developers http://developer.yahoo.com/yslow/help/