Xfree86 is slow! with software like MATLAB

[Mark Jones]

I have tried using XFree86 (linux and cygwin) for Cygwin's XFree86 and 
Linux's XFree86 and have found it to be extremely slow at refreshing the 
screen making it nearly impossible to use MATLAB's editor 
reasonably.  However, using a MS Windows emulator like Xoftware or 
Hummingbird's Exceed provides extremely fast response such that it is 
useable with various programs including MATLAB.  Is there a valid reason 
for this?  Is it being addressed?

Thanks,

Mark