[Qgis-developer] Render speed

[Albert Cervera Areny]

>
> - possibility to cancel long rendering operations (as described by Martin)
> - a faster attribute table based on model/view (as described by Tim)
> - caching of WMS tiles for fast panning actions by WMS provider

Indeed, caching should be done for all backends, GML is very slow, and others 
could see a performance boost too, acording to previous discussions. Not 
volunteering right now, though ;)

> - parallel rendering of layers on multicore processors
> - on-the-fly generalisation of complex geometries (only upon user request!)
>