profiling loading full rubygems on mingw 1.9

C:\dev\ruby>ruby-prof load_full_rg.rb
Thread ID: 10125888
Total: 5.412000

 %self     total     self     wait    child    calls  name
 46.21      2.50     2.50     0.00     0.00      226  <Class::IO>#read
 24.80      1.60     1.34     0.00     0.25      224  Gem::Specification#initialize
  5.43      1.89     0.29     0.00     1.60      224  Kernel#eval
  3.60      0.20     0.20     0.00     0.00      136  <Class::Dir>#[]
  2.33      0.15     0.13     0.00     0.03       17  Kernel#require_original_non_prelude(d5)
  2.07      0.47     0.11     0.00     0.36       21  Kernel#require_original_non_prelude(d2)
  2.00      0.35     0.11     0.00     0.24       15  Kernel#require_original_non_prelude(d3)
  1.83      0.58     0.10     0.00     0.48       23  Kernel#require_original_non_prelude(d1)
  1.57      0.24     0.08     0.00     0.16       10  Kernel#require_original_non_prelude(d4)
  1.40      4.53     0.08     0.00     4.46      224  <Class::Gem::SourceIndex>#load_specification