Low Cost, High Performance, Strong Security: Pick Any Three by Chris Palmer has a funny and informative presentation where the main message is: reduce the size and frequency of network communications, which will make your pages load faster, which will improve performance enough that you can use HTTPS all the time, which will make you safe and secure on-line, which is a good thing.
The benefits of HTTPS for security are overwhelming, but people are afraid of the performance hit. The argument is successfully made that the overhead of HTTPS is low enough that you can afford the cost if you do some basic optimization. Reducing the number of HTTP requests is a good source of low hanging fruit.
From the Yahoo UI Blog:
Reducing the number of HTTP requests has the biggest impact on reducing response time and is often the easiest performance improvement to make.
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