Why can Opera be so fast and Mozilla so slow?

[Kyle A. Miller]

Both browsers have the challenge of being multiplatform. Yet, Opera 5 is resource 
friendly, fast, and pretty standards compliant. I try to use K-Meleon as a benchmark 
as to what Mozilla can be 
without all the frills and more. Even it isn't as fast as Opera. With Mozilla being 
open source, the development team is larger. Has more brought us less?