Re: gui 'slow' with remote X ?

[Riccardo Mottola]

---------- Forwarded message ----------
Date: 2008-11-28 20:37:06 +0100
From: Fred Kiefer <fredkiefer@gmx.de>
Subject: Re: gui 'slow' with remote X ?

hns@computer.org wrote:
> > The last of these is the most relevant part here.  As I recall, when
> > we do a copy, we currently:
> > 1) Copy the relevant parts into the (client-side) buffer.
> > 2) Draw the new bits.
> > 3) Copy the buffer to the client.
>
> Doesn't it use a simple XCopyArea() which is done completely on the
> Server?
At least the xlib backend should be doing this, but I am unsure whether
there are paths where we don't hit this case. Both the scrolling of 
the message area as wellas the message table are reasonably fast, no 
excessive jerkiness or delay.
When on the same computer I stpart PRICE and siplay an image big 
enough so that it needs to scroll (an image sized about as big as my 
screen, so not an exceedingly big one either) and scroll (that means, 
dragging the scroll thumb and moving it up or down) it feels extremely 
jerky and blocky, even for small amounts (where the "new" image part 
is relatively small). It is clear that the new uncovered part needs to 
be tramsitted over the network.


--Ric