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Bug#954845: poor performance for -g 256x50

On Sun, Apr 19, 2020 at 05:53:48PM -0400, Thomas Dickey wrote:
> On Sun, Apr 12, 2020 at 11:50:32AM -0400, Thomas Dickey wrote:
> > On Sun, Apr 12, 2020 at 05:27:56PM +0200, Harald Dunkel wrote:
> > > You can reproduce the performance fall-off by using a slow network connection,
> > 
> > I suppose I could, if I had a slow connection.
> > Simulating one (from previous experience) hasn't been reliable :-(
> I found this useful
> https://wiki.linuxfoundation.org/networking/netem
> and was able to set up a test for this bug.

actually that was unnecessary.  I was able to reproduce this using
either strace or xtrace to slow things down.  The underlying issue
is an obliquely-documented(*) misfeature of the X11 library, for which
I can make a suitable workaround.

(*) I'd say "undocumented", but someone who reads the source code would
    argue that someone could _guess_ from the manual page what the code
    is actually doing :-)

Thomas E. Dickey <dickey@invisible-island.net>

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