ruby-1.8.7.log

ruby 1.8.7 (2011-06-30 patchlevel 352) [i386-mingw32]
rails 3.1.1

C:\>rails new empty-187 -d sqlite3

C:\empty-187>timer ruby script\rails runner "puts $LOADED_FEATURES.size"
705
real    4.538
system  2.667
user    1.794

ruby-1.9.2.log

ruby 1.9.2p290 (2011-07-09) [i386-mingw32]
rails 3.1.1

C:\>rails new empty-192 -d sqlite3

C:\empty-192>timer ruby script\rails runner "puts $LOADED_FEATURES.size"
719
real    9.083
system  5.272
user    3.775

ruby-1.9.3.log

ruby 1.9.3p0 (2011-10-30) [i386-mingw32]
rails 3.1.1

C:\>rails new empty-193 -d sqlite3

C:\empty-193>timer ruby script\rails runner "puts $LOADED_FEATURES.size"
724
real    4.786
system  2.808
user    1.856

tcs-1.9.3.log

tcs-ruby 1.9.3p0 (2011-10-30 revision 33569) [i386-mingw32]
rails 3.1.1

C:\>rails new empty-tcs -d sqlite3

C:\empty-tcs>timer ruby script\rails runner "puts $LOADED_FEATURES.size"
724
real    3.349
system  1.918
user    1.341

z-[redacted]-1.9.3.log

ruby 1.9.3p0 (2011-10-30 revision 33569) [i386-mingw32]
rails 3.1.1

C:\>rails new empty-[redacted] -d sqlite3

C:\>SET RUBYOPT=[redacted]

C:\empty-[redacted]>timer ruby script\rails runner "puts $LOADED_FEATURES.size"
726
real    2.658
system  0.686
user    1.903

Yes, i have same size. Moving conversation to http://groups.google.com/group/rubyinstaller/browse_thread/thread/d615a6c63f65194c as suggested by Luis.