The performance panel shows some NDunes statistics and can be used to track performance bottlenecks in a rendering. Informations reported there may be quite technical, so feel free to ignore them.

We'll find different sections reporting informations on the current workload of NDunes:

Turning on performance measurements

By pressing the left icon of the toolbar at the bottom of the panel (the speed needle), performances measurements will be turned on. This will slow down the rendering by 30-50% as detailed timers will be enabled for all detailed steps of the rendering. Once enabled, unfolding measurement counters will help understanding bottlenecks in the display. Don't forget to disable these timers once done, or you'll remain slow!

By pressing the rewind button, NDunes will stop displaying the current frame and display timers that were recorded for the previous frame. The last 600 frames can be rolled back using the rewind button to isolate performance peaks and bottlenecks. By pressing the play button back, the current frame will be displayed again. So using these buttons can be handy to move backward and forward in the performance history of NDunes.

Note that displaying the performance panel has an influence on the performance measurement itself due to the time needed to update the UI for it. This adds to the performance interference caused by the activation of timers. That's also why percentages are displayed with each value to get an idea of their importance on the total time.