On Wed, Feb 15, 2017 at 05:28:22PM +0000, Gibbs, Matt wrote: > Hi All, > > I’m working on a Qt-based project to display rapidly updating > information from a control system. I want to display hundreds of > signals, each updating at about 10 Hz. As a performance test, I’ve > thrown 500 Labels in a grid layout, and fire a timer every 100 ms > which calls setText on each label. This ends up being surprisingly > CPU-intensive: on reasonably modern hardware (2012 MacBook Pro), I use > 70% of one CPU. This doesn’t leave me much overhead to do anything > else. > > Are there any best practices to reduce CPU usage in this case?
If the labels simply display some text I'd finger-paint that in the paint event. Or, if it needs to be scrollable/have some table-like interaction then a QTableView with a simple QAbstractTableModel implementation and an item delegate for the actual painting. Andre' _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
