a patch for improving the performance

[ymnk jcraft com (Atsuhiko Yamanaka)]

Hi,

Here is a patch for improving the performance of balsa 1.0.0,
which was included in my last patch for message threadings.
  http://www.jcraft.com/balsa/balsa-1.0.0-speed.diff

I have further ideas to improve the performance,
but I have not verified them yet. If I can, I will feedback it too.

Thanks,
--
ymnk, JCraft Inc., mailto: ymnk@jcraft.com