>>114
Windows版特有の問題っぽいな
XPとUbuntuは仮想マシン上で実行

------- a.rb -------
CNT=5000

t0 = Time.now; CNT.times {|n| print n.inspect, "\n" }; t1 = Time.now; STDERR.print(t1-t0)
STDERR.print ", "
t0 = Time.now; CNT.times { |n| p n }; t1 = Time.now; STDERR.print(t1-t0)
--------------------

・Windows 7 (64bit) ruby 1.9.2p180 (2011-02-18) [i386-mingw32]
> ruby a.rb > nul
0.026001, 0.021001

> ruby a.rb > a.txt
0.007, 13.9828

・Windows XP SP3 (32bit) ruby 1.9.2p180 (2011-02-18) [i386-mingw32]
> ruby a.rb > nul
0.0625, 0.078125

> ruby a.rb > a.txt
0.015625, 8.296875

・Ubuntu 10.4 ruby 1.9.2p180 (2011-02-18 revision 30909) [i686-linux]
$ ruby a.rb > /dev/null
0.005182719, 0.009835972

$ ruby a.rb > a.txt
0.005969758, 0.033596167