Here is a list of web performance testing tools (in alphabetical order). I’ll seed it with the list I know of but if there are more that you are aware of please let me know and I can add them to the list.
None that work well that I’m aware of. Gomez offers a Visual Complete measurement that measures when all of the objects above the fold have finished loading but it works best for static pages and I’m not sure how well it deals with DHTML. I have been debating adding a similar measurement to Pagetest but most of the sites I work with are a lot more dynamic and it wouldn’t help much.
One thing we do that works well but is fairly manual is to record a video of the page load and just mark the frame when everything is complete.
There are a bunch of others I’ve got bookmarked at work, but I’m at home now…[hr]
MSFast comes pretty close to that - it’s not ideal but can give you a pretty good idea, it shows snapshots of every stage of rendering, so you can just see when the page looks complete in the snapshot and then check what point it’s at.
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Thanks. We rolled the NZ testing into the main site and I forgot to clean up the link here.
Souders doesn’t work at Yahoo anymore - YSlow was taken over by a team there and they are actively working on it. They were supposed to be working on a version that would work with IE but I haven’t seeen any activity on it for well over a year so I pulled out that comment.
I just found http://zoompf.com/ the other day - it’s pretty aggressive in the sense that it will crawl your CSS files and warn you about paths in them that don’t actually apply to any pages (among other things), but it provides another perspective and another way to look at load time metrics.
I also noticed that Speed Tracer for Chrome isn’t mentioned. While it’s not quite as easy as a FF addon to set up, I’ve found it useful to find hot spots and get a really drilled down view of what’s going on as your page renders.