I think he means the initial browser loading time.
I understand it can be an issue on slightly slower computers. My PIII 550MHz desktop at home, for example, takes about 10 seconds to open Firefox the first time. This isn't a problem on my laptop though (specs in sig). However, once you load Firefox the first time (on any machine), any subsequent runs (until the next reboot) will be just about as fast as IE's loading time due to prefetching.
The reason IE is able to load so much faster is because parts of its code are shared with Explorer (the Windows shell) and are loaded along with the operating system itself. An unfair advantage you could call it, but an advantage nonetheless. The Firefox devs are hoping to cut loading time to a minimum by the time it hits 1.0 though, so we should see noticeable improvements as more milestones come in.
TittleBitties: I completely respect your decision to go with IE, but a part of me urges me to tell you to give Firefox another chance. As I said, it's only slow to load the first time it's started after a fresh boot. Play with it for a few days. You might find that all the features, themes, and extensions available far outweigh this little problem you're facing.
Just something to think about.