IIRC the nightly builds are optimised. However, there is a lot of code which has debug code in it which can't simply be compiled out. What you're thinking of are debug symbols.
However, now that Mozilla is largely feature complete, the folks working in it are now going to turn their attention to optimising and removing the debug code. Expect Netscape 6 PR2 to be usable, but not particually fast, but PR3 (If there is a PR3) is likely to be quite a nippy little thing.
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IIRC the nightly builds are optimised. However, there is a lot of code which has debug code in it which can't simply be compiled out. What you're thinking of are debug symbols.
However, now that Mozilla is largely feature complete, the folks working in it are now going to turn their attention to optimising and removing the debug code. Expect Netscape 6 PR2 to be usable, but not particually fast, but PR3 (If there is a PR3) is likely to be quite a nippy little thing.