high traffic rails performance data point (hotspotr.com)
earthcode.com
earthcode.com
I've built embedded devices that served Perl CGI pages from an all-Perl web server far faster than that (while also doing the work it was designed to do...the Perl CGI was just the administrative UI).
I'm really quite hopeful that this isn't a good example of Rails scalability (because I've been playing with Rails of late with the intent to write my next project in it). I don't mind losing some performance and efficiency to improve coder efficiency, but there is a page load time at which your customers will get bored and leave...I don't want to find out what the load time is.