[ale] VNC very slow at displaying background

[Michael D. Hirsch]

I wanted to follow up and document the solution to this, as I'm sure
that others will have it, too.  The sympton is that a black, single
color back ground was displaying very slowing with VNC.  The problem
appears to be that the background color I chose was a 24 bit color and
VNC was rendering it very slowly.  Whether it was computing a 16 bit
representative every pixel, or dithering the output, I don't know, but
the solution is to us a color that renders easily in 16 bits, like
#b08040, rather than one with lots of bits in it like #b38f47.

Michael

On Mon, 2004-11-15 at 09:35, Michael D. Hirsch wrote:
> On Fri, 2004-11-12 at 17:12, James Taylor wrote:
> > I'm using krdc and there's a setting that allows you to disable the
> > background which seem to help performance.
> > I also have a selection of dialup, broadband or lan speed for
> > connection type, which I assumes adjusts for performance.
> > I believe you can also enable local caching and cache size.
> 
> Do you know where that setting is?  I can't find it on the GUI, not in
> the krdcrc file.  The documentation doesn't mention it, either.
> 
> Thanks,
> 
> Michael
> 
> > -jt
> > 
> > James Taylor
> > The East Cobb Group, Inc.
> > james.taylor at eastcobbgroup.com
> > 678-697-9420
> > 
> > 
> > >>> mhirsch at nubridges.com 11/12/2004 5:15:31 PM >>>
> > I've just started seriously using VNC this week, and there is something
> > I 
> > don't get.  Why is it that I can display a full screen Evolution
> > windows 
> > fairly quickly--that's a screen full of carachters and other small
> > graphics-- 
> > but when I try to display my screen background it slows to a crawl.
> > 
> > I figured it was most likely the gradient in the image.  That would
> > make 
> > sense.  So I now have a solid color background.  It is just one color
> > all the 
> > way across, and there is no noticable improvement in speed.  It is
> > still 
> > faster to display graphics.
> > 
> > Anyone else experienced this?
> > 
> > I'm using the RHEL Xvnc server and either tight VNC or the KDE client 
> > Krdc--both are like that, so I don't think it is the client.
> > 
> > Thanks,
> > 
> > Michael
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> > Ale at ale.org 
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> > 
> > 
> > 
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