3b1 terminal emulator

[th at cup.portal.com]

Naw.  It's not just you.  The ATE emulator (aka `async_main') is just
pure garbage.  It fails the Per Lindberg Vt100 validation suite within
seconds.  And its speed (hah!) is slower than frozen molasses.  And
using cu (from the 3B1's console) isn't much better.  The speed problem
has gotta be in the window drivers, because ...

hooking up a REAL VT100 to a serial port on the 3B1 at 9600 baud, logging
in to the 3B1, then using cu to call out (on another serial port or my
machine), the performance was VERY acceptable!  Sheesh ... using the 3B1
as a "buffer" is a bit extravagant!  :-)

Sooooo, WHAT does it take to correct the GLARING deficiencies of the 3B1's
window driver(s)?    (oops: 5 lines above should be: "...port ON my ...")