For anyone curious I benchmarked various builds of k-meleon in 4 popular benchmark suites. I tossed in the latest Firefox stable build and latest Palemoon stable build.
Machine used: 2.66ghz c2q q9400, 6gb ddr2-533, NVidia 610 gpu, Windows 7 Pro 64bit
Browsers were restarted for each benchmark and thread priority set to realtime.
http://peacekeeper.futuremark.com/ (Higher is better)
k-meleon 74c+1 with FF27 alpha 2 files = 1887
k-meleon 74c+1 with FF26 beta 10 files = 1692
k-meleon 74c+1 = 1725
k-meleon 1.7a2 (FF3.6.13 bits) = 719
k-meleon 1.6.0b2 = Failed to complete
Firefox 25.0.1 = 1651
Palemoon 24.2.1 64bit = 1567
http://krakenbenchmark.mozilla.org/ (v1.1) (Lower is better)
k-meleon 74c+1 with FF27 alpha 2 files = 2478.1ms +/- 1.9%
k-meleon 74c+1 with FF26 beta 10 files = 2506.5ms +/- 1.3%
k-meleon 74c+1 = 2589.5ms +/- 1.5%
k-meleon 1.7a2 (FF3.6.13 bits) = 19020.5ms +/- 0.4%
k-meleon 1.6.0b2 = Failed to complete
Firefox 25.0.1 = 2536.0ms +/- 1.7%
Palemoon 24.2.1 64bit = 2993.3ms +/- 2.9%
http://www.webkit.org/perf/sunspider/sunspider.html (v1.0.2) (Lower is better)
k-meleon 74c+1 with FF27 alpha 2 files = 234.8ms +/- 1.1%
k-meleon 74c+1 with FF26 beta 10 files = 236.4ms +/- 1.1%
k-meleon 74c+1 = 237.1ms +/- 1.2%
k-meleon 1.7a2 (FF3.6.13 bits) = Failed to complete
k-meleon 1.6.0b2 = Failed to complete
Firefox 25.0.1 = 237.2ms +/- 2.3%
Palemoon 24.2.1 64bit = 278.5ms +/- 1.9%
https://developers.google.com/octane/ (v2.0) (Higher is better)
k-meleon 74c+1 with FF27 alpha 2 files = 11245
k-meleon 74c+1 with FF26 beta 10 files = 11106
k-meleon 74c+1 = 11627
k-meleon 1.7a2 (FF3.6.13 bits) = Failed to complete
k-meleon 1.6.0b2 = Failed to complete
Firefox 25.0.1 = 11151
Palemoon 24.2.1 64bit = 9321