full benchmark from https://github.com/flavorjones/fairy-wing-throwdown

benchmark.txt

# ---------- ruby 1.8.7 (2011-02-18 patchlevel 334) [x86_64-linux] ----------
# --- 
# warnings: []
# 
# ruby: 
#   engine: mri
#   version: 1.8.7
#   platform: x86_64-linux
# libxml: 
#   loaded: 2.7.8
#   binding: extension
#   compiled: 2.7.8
# nokogiri: 1.4.4

                          user     system      total        real
json                  4.660000   0.000000   4.660000 (  4.669743)
xml (activesupport) 957.970000   0.840000 958.810000 (968.033075)
xml (noko-dom)       24.170000   0.000000  24.170000 ( 24.235939)
xml (noko-sax)       32.800000   0.000000  32.800000 ( 32.900622)
xml (noko-reader)    78.280000   0.010000  78.290000 ( 78.561482)

# ---------- ruby 1.8.7 (2011-02-18 patchlevel 334) [x86_64-linux], MBARI 0x6770, Ruby Enterprise Edition 2011.03 ----------
# --- 
# warnings: []
# 
# ruby: 
#   engine: ruby
#   version: 1.8.7
#   platform: x86_64-linux
# libxml: 
#   loaded: 2.7.8
#   binding: extension
#   compiled: 2.7.8
# nokogiri: 1.4.4

                          user     system      total        real
json                  3.060000   0.000000   3.060000 (  3.077197)
xml (noko-dom)       20.520000   0.020000  20.540000 ( 21.013871)
xml (noko-sax)       30.840000   0.020000  30.860000 ( 31.838478)
xml (noko-reader)    73.380000   0.130000  73.510000 ( 74.746752)

# ---------- ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux] ----------
# --- 
# warnings: []
# 
# nokogiri: 1.4.4
# ruby: 
#   version: 1.9.2
#   platform: x86_64-linux
#   engine: ruby
# libxml: 
#   binding: extension
#   compiled: 2.7.8
#   loaded: 2.7.8

                          user     system      total        real
json                  4.080000   0.020000   4.100000 (  4.111997)
xml (noko-dom)       17.060000   0.060000  17.120000 ( 17.126923)
xml (noko-sax)       33.730000   0.060000  33.790000 ( 33.780034)
xml (noko-reader)    56.910000   0.100000  57.010000 ( 56.999951)

# ---------- ruby 1.9.3dev (2011-04-06 trunk 31245) [x86_64-linux] ----------
# --- 
# warnings: []
# 
# nokogiri: 1.4.4
# ruby: 
#   version: 1.9.3
#   platform: x86_64-linux
#   engine: ruby
# libxml: 
#   binding: extension
#   compiled: 2.7.8
#   loaded: 2.7.8

                          user     system      total        real
json                  3.880000   0.040000   3.920000 (  3.919585)
xml (noko-dom)       16.570000   0.010000  16.580000 ( 16.593974)
xml (noko-sax)       29.690000   0.060000  29.750000 ( 29.866324)
xml (noko-reader)    53.210000   0.040000  53.250000 ( 53.578475)

# ---------- jruby 1.5.6 (ruby 1.8.7 patchlevel 249) (2010-12-03 9cf97c3) (OpenJDK 64-Bit Server VM 1.6.0_22) [amd64-java] ----------
# --- 
# warnings: []
# 
# nokogiri: 1.4.4
# ruby: 
#   version: 1.8.7
#   platform: java
#   engine: jruby
#   jruby: 1.5.6
# libxml: 
#   loaded: 2.7.8
#   binding: ffi
#   platform: jruby
# refs: weakling

Rehearsal -------------------------------------------------------
json                  4.880000   0.000000   4.880000 (  4.880000)
xml (noko-dom)      139.641000   0.000000 139.641000 (139.641000)
xml (noko-sax)      336.299000   0.000000 336.299000 (336.299000)
xml (noko-reader)   177.279000   0.000000 177.279000 (177.279000)
-------------------------------------------- total: 658.099000sec

                          user     system      total        real
json                  4.395000   0.000000   4.395000 (  4.395000)
xml (noko-dom)      137.137000   0.000000 137.137000 (137.137000)
xml (noko-sax)      338.385000   0.000000 338.385000 (338.385000)
xml (noko-reader)   177.107000   0.000000 177.107000 (177.107000)

# ---------- jruby 1.6.0 (ruby 1.8.7 patchlevel 330) (2011-03-15 f3b6154) (OpenJDK 64-Bit Server VM 1.6.0_22) [linux-amd64-java] ----------
# --- 
# warnings: []
# 
# nokogiri: 1.4.4
# ruby: 
#   version: 1.8.7
#   platform: java
#   engine: jruby
#   jruby: 1.6.0
# libxml: 
#   loaded: 2.7.8
#   binding: ffi
#   platform: jruby
# refs: weakling

Rehearsal -------------------------------------------------------
json                  5.146000   0.000000   5.146000 (  5.146000)
xml (noko-dom)      117.494000   0.000000 117.494000 (117.494000)
xml (noko-sax)      333.080000   0.000000 333.080000 (333.080000)
xml (noko-reader)   159.624000   0.000000 159.624000 (159.624000)
-------------------------------------------- total: 615.344000sec

                          user     system      total        real
json                  4.763000   0.000000   4.763000 (  4.763000)
xml (noko-dom)      113.657000   0.000000 113.657000 (113.657000)
xml (noko-sax)      336.138000   0.000000 336.138000 (336.138000)
xml (noko-reader)   157.076000   0.000000 157.076000 (157.076000)

# ---------- rubinius 1.2.4dev (1.8.7 c2992f9f yyyy-mm-dd JI) [x86_64-unknown-linux-gnu] ----------
# --- 
# warnings: []
# 
# nokogiri: 1.4.4
# libxml: 
#   loaded: 2.7.8
#   binding: extension
#   compiled: 2.7.8
# ruby: 
#   platform: x86_64-unknown-linux-gnu
#   version: 1.8.7
#   engine: rbx

Rehearsal -------------------------------------------------------
json                 14.080000   0.130000  14.210000 ( 14.264173)
xml (noko-dom)       56.510000   0.050000  56.560000 ( 56.963124)
xml (noko-sax)      104.160000   0.100000 104.260000 (104.627480)
xml (noko-reader)   143.050000   0.220000 143.270000 (143.707396)
-------------------------------------------- total: 318.300000sec

                          user     system      total        real
json                 13.480000   0.200000  13.680000 ( 13.702979)
xml (noko-dom)       56.140000   0.090000  56.230000 ( 56.349279)
xml (noko-sax)      105.170000   0.160000 105.330000 (105.539719)
xml (noko-reader)   143.370000   0.200000 143.570000 (143.761971)