According to this site[1], CrapWow seems to be the best in raw performance: http://www.team5150.com/~andrew/noncryptohashzoo/CrapWow.htm... (Crap8 in second place and Murmur3 in third place - one at a time performs quite badly in this guys benchmarks)

Performance graphs: http://www.team5150.com/~andrew/noncryptohashzoo/speed.html

[1] http://www.team5150.com/~andrew/noncryptohashzoo/