Slo-o-o-w ANSI emulation

[Jim Blue]

'wsh' interprets escape sequences, emulating an ANSI terminal, but
some of the emulations are quite slow. Especially slow is changing
from the normal color to the highlight color. Is there any other
way to draw different-colored characters in a 'wsh' window? It 
doesn't have to be portable, just fast. Similarly, is there any
way to move the cursor position other than sending the ANSI escape
sequence?