Shared memory support is needed by the MIT-SHM and XFree86-BigFont extensions, which may provide better performance for local applications which use large images or fonts and are written to use those extensions.
Shared memory is provided by the cygserver Windows service. To install cygserver, install it using setup.exe and then run the cygserver-config script to install the service.
Note: for Cygwin 1.5 only
XWin.exe will not use shared memory if the
CYGWIN
environment variable does not contain theserver
keyword. Starting XWin.exe withwill enable shared memory support if the cygserver service is running.
CYGWIN=server XWin.exe