[FreeNX-kNX] Re: Logging in takes a long time

[Fritz Elfert]

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On 30.04.2011 22:36, Yves Goergen wrote:
> On 30.04.2011 19:05 CE(S)T, Les Mikesell wrote:
>> It has to adjust your cached screen copy to the current state before that first 
>> display. If your desktop has a color gradient or complex image that can't be 
>> compressed in big chunks it may take longer.  Does it make a difference if you 
>> set the background to a solid color and perhaps play with the client cache 
>> options (the modem->LAN slider and the size settings in the advanced tab)?
> 
> The desktop has a solid background colour already, because this is a
> working machine and nice photos don't load well over the internet. :-)
> Nothing to improve here. I even minimise the single Terminal window
> often before I disconnect so the desktop really doesn't contain anything
> else than the two Gnome bars and 9 icons.
> 
> I should add that I have modified the compression settings to "Only use
> RGB compression" because otherwise I'd get ugly JPEG artifacts on the
> screen which is simply unsuitable for a desktop environment with text
> and that. All of the other "Performance" options are not ticked (should
> be default).
> 
> I had set the connection type slider to "ADSL", just because it's true.
> No idea what it's good for. Some website I found today says that "LAN"
> would disable all compression whereas "Modem" enables best compression.
> Well, I see no difference whether I select any of them.
> 
Even with a solid background, setting it to RGB probably is the reason.
If you set it back to JPEG, then you can fine-tune the amount of
compression with the "connection type" slider to find the right balance
between artifacts and speed. AFAIK, whith compression set to RGB the
slider gets pretty useless.

Another benefit of using JPEG compression:
By replacing libjpeg with libjpeg-turbo
[http://libjpeg-turbo.virtualgl.org/] on *both* server and client, you
can gain another speed-boost. If using Fedora 14, libjpeg-turbo is
already the system-wide default and you just have to delete NoMachine's
own libjpeg in order to make libjpeg-turbo getting picked up. On other
systems, simply replace any libjpeg in /usr/NX/lib by libjpeg-turbo.
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