Normally ASP pages are considered active content. That's sort of the whole point of the name Active Server Pages. There are times, however, when it is desirable to use ASP to generate a page and yet its content doesn't change very often.
It's this type of situation when caching can really boost the perceived speed of your site.
By default most proxy servers won't cache dynamic content including your ASP pages. If you have a script in which the information rarely changes, try placing the following line at the top of your ASP script.
Response.CacheControl = "Public"
It'll really help boost your site's apparent speed for users who visit your site from behind a proxy.