Re: Gtk_Tree_View, drawing speed

[Arne Pagel <arne pagelnet de>]

Thank you for this hint,

I tried it and indeed I notice a speedup, but just factor ~1,3.
There must be something more.

I removed all columns expect the "Value" column, and now I notice a speedup factor of ~3, if I remove just 
one column, is see a speedup factor of ~2.
Now I am sure that there is some processing on cells where the corresponding data in the treestore are not 
touched.
If I remove columns on the first treeview which is using the same tree-store I see no effect.

What is interesting that I now notice also a speedup of my single elements objects, there now I can achieve 
an update rate of 570 requests per second.

- -

I just noticed that I can't compare the single element objects and structured objects in that way I did 
before,
but anyway, with the column removing I see some potential for speeding up everything.

Of course the given value of 570 requests per second is not the design goal of the program.
But later I want to have many structured objects in the treeview with an acceptable update rate and not 100% 
CPU load.

regards
  Arne

Am 26.09.2012 10:51, schrieb jcupitt gmail com:
> On 26 September 2012 07:09, Arne Pagel<arne pagelnet de>  wrote:
> > Do you see any other option?
>
> Have you tried setting the fixed-height hint on the treeview?
>
> By default treeview supports variable-height rows. This is great, of
> course, but there is a performance penalty: whenever the model
> changes, the view has to rescan the model and recalculate all the
> heights. If all your rows are the same height, and they might be from
> looking at your screenshot, you can set the fixed-height hint and get
> treeview to just sample a single row.
>
> http://developer.gnome.org/gtk3/stable/GtkTreeView.html#gtk-tree-view-set-fixed-height-mode
>
> John