[FreeNX-kNX] poor performance over ADSL - what settings are best?

[Tomasz Chmielewski]

Hi,

I just deployed freenx-0.3.0 on my home machine and run a mail client 
over NX from work (normally I use VNC to see the whole desktop).

I noticed that performance is rather bad, it's worse than that of VNC 
vino-server / KRDC (using low quality), not to mention when I connect 
from home to workstations at work using Windows Terminal Sessions, which 
just works as a blast when compared to NX and VNC.


The most disappointing fact is that NX has to refresh the whole window 
(for example, when I run Mozilla Thunderbird like now over NX) whenever 
it gets minimized - and it takes as long as 5 or more seconds when the 
screen is just blank (sometimes it takes less, but mostly more).

I'm just not used to it after using VNC - with VNC when I minimized a 
window and then maximized it there wasn't a need for a refresh (VNC 
client kept everything in memory and didn't loose it when minimized like 
NX does).


Other thing is setting "link quality" - although I have it set to 
"Modem", and I tried different encodings, I didn't notice any difference.
Maybe it (different encodings) just doesn't work with freenx? I tried 
setting "custom JPEG image compression" from 0 to 9, but I noticed no 
speed difference (and even no quality difference, which should be the 
case with JPEG, right?).


I have a 2Mbit down / 20 kB uplink at home, and 1 Mbit symmetric link at 
work; uplink at home is at about 50% when I use NX (it uses 6-8 kB/s 
when I use NX), and my work link is basically not used.
I don't use SSL tunneling, so it's not a factor for the "slowness".


So any ideas how to improve NX experience would be welcome (especially 
this window refreshing when minimized/maximized is annoying).



Tomek