Roy Schestowitz <newsgroups@xxxxxxxxxxxxxxx> wrote:
> Thank you, Chris. I guess I never thought about the aspiration of this
> desktop environment to be efficient (KDE is greedy) and thus re-draw ele-
> ments on the screen rather than set them aside. Having said that, when
> switching from one desktop to another, the applications sometimes appear
> immediately, as does the wallpaper image. It's almost as if not only are
> the invisible windows kept in RAM, but they also reside in some form of an
> extended frame buffer which can then 'channelled' to the monitor; no pause
> necessary.
Yes, that's perfectly possible; each application (window) can request
of the Window Manager that it's to be given a pixel map in which it can
store its image rather than being expected to redraw it on deman. For
complex images (fractals spring to mind as a pathological example)
this can be a big speed win.
>From within a terminal window, try running xwininfo and then clicking on
one of your other application windows. You'll get a load of information
about that window including its "save under" state.
Chris
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