That's quite a surprise, I'd have bet Waterfox is fastest because of the Intel compiler - and in your benchmarks it's last (I wouldn't count in palemoon, it's based on an older ff version). However, I just ran browsermark and have to confirm it - Waterfox is slowest, even though a 5% difference cannot be felt in real life browsing.
Waterfox 3227 (100%)
Nightly 3341 (3.5% faster)
Cyberfox 3388 (5% faster)
Conclusion: This post has been written with Cyberfox :-p but I really would like to see my Waterfox catch up again in the next version!