Graphical Update Slowdown when being Monitored
jnw "at" realvnc.com
Tue Mar 22 17:17:00 2005
Has anyone installed any new anti-virus / firewalling software or updates,
for example, that migth affect network traffic?
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:
> >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.
> >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
> >>VNC-List mailing list
> >>VNC-List "at" realvnc.com
> >>To remove yourself from the list visit:
> Mark Jacobs
> VNC-List mailing list
> VNC-List "at" realvnc.com
> To remove yourself from the list visit: