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VNC: Poor screen updates

Posted on 2004-04-12
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Last Modified: 2012-05-04
I've been using VNC for a couple of years now to remotely manage computers. I've always experienced poor screen refreshes, such as typing text into a dialog box and not seeing it unless I move the box around, or generally not seeing what is going on unless I force a refresh.

Another system admin wants to give users remote access with VNC and I don't see how the users are going to put up with poor screen refreshes.

The commections are generally "broadband", either over a LAN or with DSL.

Am I using the wrong settings?
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Question by:TerrellITC
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by:HeathAdams
ID: 10808490
Waht version of VNC are you using.  Tightvnc (www.tightvnc.com) lets you optimize your display settings and I've had very good luck with it so far.
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Author Comment

by:TerrellITC
ID: 10808895
Hi HeathAdams,

Up until last month, RealVNC. I've always kept up to date on the upgrades, thinking that it was a software problem. It was last week that I realized it may be a configuration problem.

I've tried TightVNC as well, but it also seems to give me artifacts. (I just realized that this may be a problem from the RealVNC viewer I'm using.)
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Expert Comment

by:HeathAdams
ID: 10812990
Are these computers fairly fast?  What is the processor and RAM on the machines and what are the video cards you're using?  Try changing the background on the desktops as this may cause some lag.
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HeathAdams earned 125 total points
ID: 10813102
Also try using 16 bit color (65536 colors).  VNC handles this better than any other resolution, even a lower one like 256 colors becuase there's very little recalculating to do on VNC's part.

Something else, are the computers OS updated?  If not, I recommend it.  

One more thing to try is download and install the latest java plug-in at www.java.com.  It may use a different codec that will work better for you.

Last, use SSH to encrypt the data flowing between the computers.  You're going to want to do this anyway if you have remote users using VNC.  SSH compresses the data as it encrypts it, speeding up data transfers.  Go here to find info on how to do this: http://www.uk.research.att.com/archive/vnc/sshvnc.html
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