I'm running Mozilla on a Pentium II 350 with 128 MB SDRAM (WinNT), and I find it's performance VERY sluggish. Not to mention the fact that it's a huge memory hog -- 22 MB!!
This is a way too general complaint as to be a specific bug. General performance is worked on anyway.
firstname.lastname@example.org - are you talking about mail performance? You can do a query on the keyword field = perf to see what specific performance bugs have been logged. If there is a specific item that you find slow that is not logged yet, then please log a bug for that. Thanks.