PDA

View Full Version : QGraphicsView performance in 4.6



Lodorot
18th September 2009, 00:19
Hi,

the "What's New in Qt 4.6" page says:

"Performance Optimizations: Rewritten the QGraphicsView rendering algorithm."

Has anybody tested what this means? Is there a real performance boost? Does it help for the performance problem of QGraphicsView when handling many items.

Thanks

Lodorot

wysota
18th September 2009, 00:39
Does it help for the performance problem of QGraphicsView when handling many items.

What performance problem are you referring to? Handling many items is usually not a cause of significant slowdowns by itself. It's more often caused by other factors (i.e. complexity of items) - GV has been tested against millions of items with a satisfactory result.

Lodorot
21st September 2009, 00:09
GV has been tested against millions of items with a satisfactory result.

The problem comes if items are moving or changing shape than already 500 items could result in poor performance and the CPU goes really up.


Lodorot