Newsgroups: comp.windows.ms
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!snorkelwacker.mit.edu!stanford.edu!leland.Stanford.EDU!jessica.stanford.edu!aaron
From: aaron@jessica.stanford.edu (Aaron Wallace)
Subject: Re: slowness of screen drivers
Message-ID: <1991Jun9.204138.24513@leland.Stanford.EDU>
Sender: Aaron Wallace
Organization: Academic Information Resources
References: <1991Jun7.100103.8975@Informatik.TU-Muenchen.DE>
Date: Sun, 9 Jun 91 20:41:38 GMT
Lines: 33

In article <1991Jun7.100103.8975@Informatik.TU-Muenchen.DE> rommel@Informatik.TU-Muenchen.DE (Kai-Uwe Rommel) writes:
>
>Now, under Windows 3.0 the moving of windows on the screen is
>unbelievable slow in comparison to OS/2. This too applies to both chip
>sets although here too the Tseng 4000 is faster (significantly). Moving
>a window of about 700x450 on the 1024x768 display took about or more
>than a second (!!!) on both cards. One can view every scan line beeing
>copied. This was not a problem of my particular machine configuration or
>Windows 3.0 installation but occured on several tested machines.
>
>Has anyone an explanation for these big differences in window moving
>speed of these two environments? This is even more surprising as both
>are basically 16 bit environments and are based on similar technology.
>
>I am not talking about 20% or even 50% of speed difference but almost
>an order of magnitude!
>
>Kai Uwe Rommel

I sent Kai mail suspecting that it has to do with a window-position grid
and came up with a farily neat speed-up-Windows trick.  Under the
Control Panel desktop section, set the Grid Granularity to 1.  This will
cause all Windows to snap to byte-multiple locations.  They'll seem to
reposition much faster, at least on VGA-type displays.  Why is it that the
VGA has such a hard time moving windows to arbitrary horizontal positions
when the Herc can do it as easily as anything?

Still don't know if this is the OS/2/Windows difference, but it could be...

Aaron Wallace