Yes, we all have this problem.... unfortunatelly the bug that causes this is
in Windows, and not on WinVNC...
What happens is that Windows is not sending information about which programs
have updated their screens correctly to VNC, so it can't update the client
correctly.
To solve this, all you can do is turn on the option 'Poll Full Screen' in
the WinVNC (App Mode), right inside it's 'Properties' option.
Hoping to have helped,
Gustavo Wagner
Rio de Janeiro, Brazil
----- Original Message -----
From: "Mario Becroft" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, July 06, 2001 8:29 AM
Subject: WinVNC performance disappointing
> Dear VNC users,
>
> I have set up VNC for use on some UNIX and Windows hosts, and while the X
> version of the server works well, the Windows server appears extremely
> slow or does not update the screen correctly. I have a sneaking feeling
> that this might be a common problem, but the documentation seems to imply
> that usable performance is achievable with WinVNC on a 10 megabit network,
> hence my enquiry...
>
> I am trying to use VNC to control a Windows 95 host from my X workstation.
> I am using the most recent version of the WinVNC and UNIX VNC software
> from the VNC WWW site. I installed the binary WinVNC distribution as
> service on the Windows 95 host, and I compiled the VNC viewer from the
> UNIX source code on the Linux PC where I wish to use the viewer. My X
> display is local on the PC. The Windows host is a 200 MHz pentium
> processor and has Windows 95 installed. The two hosts are connected via 10
> megabit ethernet and there is little or no other data passing over the
> network.
>
> With the default configuration of WinVNC, it feels very fast (at least
> insofar as the remote mouse pointer tracks the local pointer very closely)
> but in most cases, nothing gets drawn on the screen except where the mouse
> pointer moves. As I move the mouse around the screen it leaves a trail of
> correct display, but aside from that nothing is ever drawn to the screen.
> (On the monitor attached to the windows box everything appears as normal,
> of course). For example, if I boot Windows then double click on the "My
> Computer" icon, the display as seen in the VNC viewer does not change.
> However if I move the mouse from side to side across the screen, I can
> "uncover" the window that was opened. I have tried various programs and
> all seem to be affected by this problem with the exception of the WinVNC
> configuration tool, which appears to work somewhat better (although there
> was still some screen corruption). The only other exception is at the
> moment when I execute the VNC viewer, at which time a complete correct
> copy of the screen is displayed.
>
> The curious thing is that even though nothing seems to be getting drawn on
> the VNC viewer, the host still displays much slower than normal, as though
> the screen is being transmitted via the network. For example after
> clicking on the Start button, it takes a moment for the start menu to
> appear where normally it would appear straight away. I assume the delay is
> transmission of the image before it is drawn on the local screen - yet
> nothing appears on the VNC viewer.
>
> It does not seem to be a case of the image being transmitted before the
> screen is updated, since if the screen is corrupt behind a window being
> opened, for example, it remains in that state.
>
> Turning on the "update whole screen" option solves the problem, but makes
> the system so extremely slow that it is barely usable. It even makes the
> computer run very slowly when the screen is not being updated; programs
> take about 5 times longer to load than is normal, and it takes about 5
> seconds to display a drop down menu, for example. Although another curious
> fact is that when this is happening, there is only minimal network traffic
> coming from the windows machine - so obviously the performance bottleneck
> is not associated with the network, but with some kind of processing being
> done on the windows host.
>
> I have tried 8- and 16-bit screens, two different graphics cards, and
> various combinations of WinVNC options without observing any improvement.
>
> Any advice, either to the effect that what I observe is normal, or else
> what to do about it, would be much appreciated.
>
> --
> Mario Becroft <[EMAIL PROTECTED]> - http://gem.win.co.nz/mb/
> 68HC08 support site - http://www.hc08.net/
> ---------------------------------------------------------------------
> To unsubscribe, send a message with the line: unsubscribe vnc-list
> to [EMAIL PROTECTED]
> See also: http://www.uk.research.att.com/vnc/intouch.html
> ---------------------------------------------------------------------
---------------------------------------------------------------------
To unsubscribe, send a message with the line: unsubscribe vnc-list
to [EMAIL PROTECTED]
See also: http://www.uk.research.att.com/vnc/intouch.html
---------------------------------------------------------------------
