Hi Andrew. Good name.
I tried only answering only the first question in your poll, because quite honestly I have no idea which browser is fastest. But the board said that leaving that question unanswered was not a valid response, so I just said Internet explorer again. It probably skews your results, but I can't help that.
I mainly use Internet Explorer 5.2 for OS X because the OS X installer put it there, it works acceptably, all my bookmarks and settings are as I want them, and I understand it well enough that I am able to use it efficiently. I occasionally use Netscape Communicator 7 to download certain files that I can't get to download normally with either browser, but sometimes I am able to recover the download from Communicator's cache folder, or to use interactive forms on some websites that don't recognize Internet Explorer for Mac, but do recognize Netscape Communicator for Mac. It's happened maybe 3 or 4 times since I started running OS X, I don't know what the issue is, but apparantly there is one.
I have tried Safari, and generally like it, but the beta version I tried doesn't display marquee tags. I realize they are nonstandard HTML, but they are extremely useful in certain websites I visit and help maintain. So I use a browser that displays them, which is Internet Explorer. I don't notice any significant speed difference between these browsers on my system. If Safari supported marquee tags, I might consider trying it more.
I tried Mozilla a few years ago, before OS X, but it didn't work. I understand it's gotten better, but I haven't tried it again. Nor have I tried the others you mention.
You haven't mentioned MacWeb, which was the one of the first browsers I used, back on my Mac Plus with 4 MB RAM under System 7.1. Just for giggles I tried it again today. It doesn't seem to work under Classic. Too bad, because there once was a time when I could answer your question about which browser was fastest. Back when Netscape Navigator was still Mosaic and I don't know if there even was a version of internet Explorer for Mac, MacWeb was fastest.
Andrew Gapstr.