Terminal Services v. VNC

Mike Miller mbmiller "at" taxa.epi.umn.edu
Sat Jan 3 08:11:00 2004

A friend sent me a message (not to this list), which is appended below.
He claims that Windows Terminal Services will do for me what VNC does, but
Terminal Services runs much faster.  I'm wondering if he is correct.  I
think he's wrong about bmp encoding, for one, but is any of it correct?

Thanks in advance!


Michael B. Miller, Ph.D.
Assistant Professor
Division of Epidemiology
and Institute of Human Genetics
University of Minnesota

On Sat, 3 Jan 2004, a friend wrote (off list):

> VNC sends compressed bmp data of changed pixels when a screen change occurs.
> Terminal Service operates lower in Windows GDI and is much faster. Example -
> I type "Hello World" in wordpad. In a VNC session it polls the window,
> decides which pixels changed, grabs the bmp data for those pixels,
> compresses it and sends it. Terminal Services says "Hello World" was entered
> into this app - display it. The difference is very significant.
> As an example - VNC is sluggish via broadband while Terminal Service is
> substantially faster over a 28.8 modem (I've seen this).
> I don't know about X - though I know Windows-based X servers are typically
> slower than Linux. Typically when I have to use Cygwin I'm coming over an
> IPSec VPN - which I think it frigging my MTU and causing me
> fragmentation-induced performance hits.