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X11 forwarding extremely slow (unusable) after Cygwin upgrade on Dec 23rd



I have a Cygwin installation on a Windows 10 PC, on which I use X-Windows to
access a Linux development/build server. All has been working great for a
long time, until I rand a Cygwin upgrade on December 23rd, and after that
X11 has become pretty much unusable. I normally launch the terminator
terminal emulator locally under X, in that I "ssh -Y" to the Linux machine,
and then on there I use a number of GUI apps, mainly SlickEdit and
BeyondCompare, which run remotely via X11 forwarding to display in windows
on my local Windows PC. But since this Cygwin upgrade all of those remote
X11 apps are now extremely slow to respond to anything - about 10 to 20
seconds to action any key press or mouse click.


The two machines are on the same Gig-Ethernet LAN segment so there are no
latency issues there (ping response time <1mS).


To take any possible problems with those components out of the picture, I
tried instead launching xterm under X11 locally, and from it launching
Firefox after ssh to the Linux machine, and again I see the same symptoms
with that - trying to type into Firefox's address bar takes about 10 seconds
per letter.


I had previously updated my Cygwin installation on March 3rd 2019, so this
problem has come in sometime between then and now. I've just spent a very
long day and a half rolling back the changes as much as I could (by hacking
the setup.ini and re-installing previous versions from the local download
cache) and eventually managed to get a working hybrid with enough packages
rolled back to make the difference, and now X11 is working fine again.


I also tried a new clean install of the latest Cygwin, after deleting my
.XWinrc and removing all but the bare minimum from .startxwinrc, and do see
the problem with that too.


Is this any known problem? I couldn't find anything obvious in the email




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