VNCViewer slow on Win32 vs Linux

[Jeff Boerio]

Jeff (nice name),

I feel your pain.  Actually, my user's do, and they've been inflicting
heavy damage on me.

We have been having terrible problems with certain CAD tools taking a
considerable hit when using a Windows VNC viewer and connecting to a
UNIX VNC server.  Take the same hardware and put it on Linux, the
viewer's performance is dramatically improved when connecting to the
same server.  Even using Windows-based Exceed X servers would perform
better than the VNC client.

I have been working closely with the folks at Real VNC to supply them
with data on where the problems might be, and we've made excellent
progress.  In fact, the VNC client is usually out-performing Exceed, and
performs just as well as the UNIX clients.

All of this has been developed on a code base for a future VNC release,
not on the code base for what's available now, and we'll need to sit
tight and wait for Real VNC to announce when this new version will be
available.

     - Jeff

On Fri, 2003-04-25 at 09:41, Jeff Gilchrist wrote:
> I have a VNC server running on a RedHat 9 box, P4 1.8GHz, lots of RAM, and 
> it is sitting on a 100Mbit switched LAN.  I also have a workstation (P4 
> 1.5GHZ, 512MB RAM, Quadro2 EX video) that dual boots to Win2000 and RedHat 
> 7.3.  The VNCServer depth is set to 16bits and resolution is 1152x864 and my 
> workstation's depth is 32bit and 1280x1024.
> 
> When I am in RedHat 7.3 using XFree86 with KDE, and use the bundled TightVNC 
> viewer to connect to the RH9 server machine, it works fine.  Everything is 
> VERY smooth, no choppy video, runs perfectly.  When I boot the same machine 
> into Win2000, using either the latest version of TightVNC or the latest 
> RealVNC viewer, connecting to the same VNC server the video is choppy.  When 
> I drag windows around inside the VNC viewer is it slow and choppy.
> 
> Does anyone have an idea why the speeds are so different on the same 
> hardware in Win32 vs Linux?  Does VNC under Linux use a different protocol 
> than VNC under Windows?  Anyone know how to get Win32 to perform like the 
> VNC viewer on Linux?
> 
> Thanks in advance,
> Jeff.
> 
> 
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