Graphical Update Slowdown when being Monitored

[James Weatherall]

Mark,

Has anyone installed any new anti-virus / firewalling software or updates,
for example, that migth affect network traffic?

Regards,

Wez @ RealVNC Ltd.
 

> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com 
> [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Mark Jacobs
> Sent: 22 March 2005 09:25
> To: James Weatherall
> Cc: vnc-list "at" realvnc.com
> Subject: Re: Graphical Update Slowdown when being Monitored
> 
> Let me try to give more details.
> 
> 1) It was working fine last week. It is only since yesterday 
> that it has 
> been behaving like this, and yet there have been no changes to any of 
> the hardware setups.
> 2) The jerkiness only occurs *when* the PC is being monitored 
> - ie. it 
> is only when the VNC Server running PC is being viewed by 
> VNCViewer. At 
> all other times, the server does *not* interfere with the 
> operation of 
> the PC.
> 
> Why has this suddenly occurred on *all* our PCs 
> simultaneously when they 
> were running fine last week?
> 
> James Weatherall wrote:
> 
> >Mark,
> >
> >How much effect VNC Server has on system performance depends 
> heavily upon
> >the system hardware & drivers.  One things you may wish to 
> try is disabling
> >"Capture alpha-blended windows" in the "Capture Method" tab 
> of VNC Server
> >Properties.  Capturing of alpha blended windows requires use 
> of Windows APIs
> >that can impact performance in some cases.
> >
> >The VNC Mirror Driver should further improve things, when it 
> is released.
> >
> >Regards,
> >
> >Wez @ RealVNC Ltd.
> >
> >
> >  
> >
> >>-----Original Message-----
> >>From: vnc-list-admin "at" realvnc.com 
> >>[mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Mark Jacobs
> >>Sent: 21 March 2005 14:04
> >>To: vnc-list "at" realvnc.com
> >>Subject: Graphical Update Slowdown when being Monitored
> >>
> >>We have VNC Enterprise 4.1.3 server installed as a service on some 
> >>client Win XP Pro SP2 PCs. We use VNCViewer from the 
> supervisor PC to 
> >>"look at" active screens. We have noticed that when a PC is being 
> >>viewed, the graphical updates on the viewed PC are slowed down to a 
> >>point where :-
> >>
> >>1) The user notices it.
> >>2) It interferes with the normal smooth operation of all 
> >>programs that 
> >>update the screen.
> >>
> >>We have even tried a simple text document in Notepad, and 
> >>scrolling up 
> >>and down is smooth when not being monitored, and jerky when being 
> >>monitored. Any ideas, anyone?
> >>
> >>-- 
> >>Mark Jacobs
> >>http://www.dkcomputing.co.uk
> >>_______________________________________________
> >>VNC-List mailing list
> >>VNC-List "at" realvnc.com
> >>To remove yourself from the list visit:
> >>http://www.realvnc.com/mailman/listinfo/vnc-list
> >>
> >>    
> >>
> >
> >
> >  
> >
> 
> -- 
> Mark Jacobs
> http://www.dkcomputing.co.uk
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