l xmlns="http://www.w3.org/1999/l">
The judicious use of output caching can provide a ten-fold performance increase, depending on whether or how much of a page can be cached and how many variations there are for different users. To enable output caching for a page, use the OutputCache directive:
<%@ OutputCache Duration="#ofseconds" Location="Any | Client | Downstream | Server | None" VaryByControl="control-name" VaryByCustom="browser | custom-string" VaryByHeader="headers" VaryByParam="parameter-name" %>