Jay Marcyes

contains some code for getting page load time in js, as well as some great tips to reduce your site's page loading time. I haven't gone through it all but I wanted to make sure I have a copy of it for the future.

Google Groups posting rebutting the statements made in this Google performance tips article. The rest of the discussion is people sharing their own performance tips.

I liked Dave Winer's response on the perceived overhead of parsing xml:

when we wrote our XML parser for Frontier, in C, the typical machine
ran at 200 MHz and had about (guessing) 100MB of memory. Obviously
today's machines are much bigger and faster, yet people *still* raise
the encoding and decoding perf issues as if they matter in 2009, I
don't see any evidence that they do.

I think he is right, parsing xml, while I'm sure it is slower than parsing json, I bet it isn't that much slower. Today's computers are so fast that parsing text is almost a non-issue, no matter what transportation format the text is in.