New IE Performance Blog Post: Vary With Care

I'm currently at the Velocity Web Performance conference, and I'll be giving a short talk about Fiddler tomorrow morning.

I've finally found a moment to write up an interesting performance-related tidbit with regard to how IE handles the "Vary" header. We made a significant improvement here for IE7, but you should still be aware of IE's limited support for this header.

http://www.fiddler2.com/fiddler/perf/aboutvary.asp