or download this
Benchmark: timing 1000 iterations of None, Slasho, qr...
None: 70 wallclock secs (69.60 usr + 0.00 sys = 69.60 CPU) @ 14
+.37/s (n=1000)
Slasho: 61 wallclock secs (61.24 usr + 0.00 sys = 61.24 CPU) @ 16
+.33/s (n=1000)
qr: 66 wallclock secs (65.80 usr + 0.00 sys = 65.80 CPU) @ 15
+.20/s (n=1000)