Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!YKTVMV.BITNET!DAN
From: DAN@YKTVMV.BITNET
Newsgroups: comp.windows.x
Subject: Performance Delta of X11 vs X10 When Creating Many Windows
Message-ID: <8901051550.AA01283@EXPO.LCS.MIT.EDU>
Date: 5 Jan 89 15:45:31 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 20

My customer has an application which creates a top level window,
several sub-windows of this, and in one sub-window, close to a
thousand sub-windows.  The program was written for X 10.4, where
it performed reasonably well (a few seconds to map all the windows.)

They are now re-writing the application for X 11 (still using XLIB,
no toolkits or widgets) and it now takes minutes to map the same
windows!  When they changed the application to make all windows
children of the root window, performance improves considerably.
This is not really acceptable, as the windows belong in a hierarchy,
and making them children of root interferes with a lot of things
(moving, re-sizing, etc.)

Does anyone have a clue why this might be happening, or any suggestions
on what to do about it?  Thanks in advance.

Regards,
W. Brennan Carley

Submitted by: Walt Daniels