Justin,

Which terminal program are you using in your VNC desktop?  Xterm handles
scrolling by actually shifting the contents of the display, allowing VNC to
reproduce the effect efficiently.  Many other terminal programs actually
redraw the entire terminal window every time you scroll, which leads to the
sorts of effect that you are seeing.

Regards,

Wez @ RealVNC Ltd


> -----Original Message-----
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of justin sarma
> Sent: 23 June 2007 15:45
> To: vnc-list@realvnc.com
> Subject: VNC Viewer's Slow Refresh Bothers The Eyes
> 
> Does anyone know if it is possible to reconfigure VNC viewer 
> so that it only 
> starts to redraw the screen once the entire screen update is 
> received? Right 
> now, if I'm typing a line in a unix console, then hit return, 
> it starts 
> redrawing the screen at the top, and finishes at the bottom. 
> If there's a 
> hiccup in between it might pause half way through. I find 
> myself closing my 
> eyes right before I hit return, waiting 2 seconds, then 
> reopening, just to 
> avoid the eyestrain of watching the slow refresh.
> 
> Putty SSH seems to redraw much quicker. I'm guessing this has 
> something to 
> do with it being text based, and requiring less data 
> transmission. This is 
> understandable, and wouldn't be a problem if vnc viewer had 
> an option you 
> could set which would cause it to wait until it's received an 
> entire screen 
> update before it starts to draw. Maybe this wouldn't be 
> optimal for cases 
> when only a small portion of the screen needs to be refreshed 
> (like the 
> blinking cursor). But if the entire screen is updating, it 
> seems like some 
> sort of 'double buffering' scheme would make VNC much more usable.
> 
> By the way, I'm a windows VNC client over a PPTP VPN to a 
> linux based VNC 
> server. If anyone has any optimizations to suggest besides 
> changing the 
> number of bits used for color, or the color depth, I'd more 
> then appreciate 
> it.
> 
> Thanks everyone.
> 
> -justin
> 
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