Age Expiry fails?

[pmeenan]

FWIW, the in-session cache logic for browsers is significantly different from the logic that is used when they come back in a new browser session so trying to tune the cache for their session doesn't really buy you much.

Even in the Yahoo study, 40-60% of users (and 80% of page views) were a cached experience and the performance improvements are enormous. The main point of the post is to not ignore the first-time experience and assume that your users have everything cached, but the same is true the other way - if you could make the experience 80-90% faster for 40-60% of the users it certainly deserves your attention :-)

Unless you're willing to accept your site being broken for 45 minutes at a time, you need to do the same work to allow for a 45-minute expiration as you would for a long expiration so why not?