Desktop, Athlon 64 X2 2.3GHz:

js/firefox 0.03 seconds
c/gcc      0.07
js/chrome  0.33
py2+psycho 0.35
py3        2.59
js/opera   2.78
js cscript 3.06
py2        3.23
perl       3.36
js/ie8     4+
ruby       7.77
rebol      7.89

js/chrome  0.73 (2.2x)
js cscript 5.34 (1.7x)
py3        5.42 (2.1x)

speedtest.dslreports.com