Re: [Canorus-user] Canorus very slow for longer scores

[Matevž J. <mat...@gm...>]

Hi Andreas.

I had similar issues when writing longer scores. There is a slight
speedup (maybe around 10%) by disabling the Anti aliasing in
Preferences->Editor settings.

The speed issue originates in slow rendering speed (calling draw()
method on 10.000 elements). We're planning to eliminate this by
rewriting our rendering engine and using QGraphicsWidget instead of our
own engine. Unfortunately this widget was introduced in Qt version 4.3
which was released over a year after we designed Canorus. I plan to do
this for the next release.


Regards.
-Matevž

Andreas Schneider pravi:
> Hi,
>
> for longer scores, Canorus is very slow. For example, for a piece with 221 
> bars and four staffs, when I change a note in edit mode, after pressing the up 
> key Canorus takes more than 30 seconds (!!) to react (on a 1GHz Pentium III). 
> In the mean time CPU load is about 95%, and Canorus does not redraw or react 
> to anything. Similar (but mostly slightly less) times are needed for other 
> editing operations, e.g. to delete an object. That way Canorus is unusable. 
> Shall I send an example file?
>
> Best wishes
>
> Andreas
> _______________________________________________
> Canorus-user mailing list
> Can...@li...
> https://lists.berlios.de/mailman/listinfo/canorus-user
>
>