[fortepianissimo]

VNC client on Mac is never on par with their Windows/Linux brethren in terms of speed (at least for me). I just tried screen sharing in Leopard (via a vnc://host:5900 URL typed in the Connect to Server... dialog in Finder), and it's even slower than the other well-known clients (Chicken of the VNC, RealVNC client). Worse, I can't do cmd-tab within the vnc window.

What's your experience? Any better alternatives?

[mjankor]

I've found the screensharing across our network to be, subjectively, about twice as fast as Chicken. It also looks heaps better. I'm using the "adapt quality to suit network conditions" option.

[C.A.T.S. CEO]

Chicken of the VNC would work normally for a minute, then slow down to a few bytes a sec (this is when I had Tiger). Screen Sharing is fast and doesn't take a lot of bandwidth, even when I log into my Linux box.