OnRender optimizations

[Magzor]

Hey, so currently I'm looping through chartBars in my Onrender function to draw a bunch of stuff. When I turn up the "days to load" it becomes quite slow, and I can see that it's the OnRender() causing this. So is there a way to only get the bars that are displayed? And are there any other tips for optimizing OnREnder type drawing?

[QuantKey_Bruce]

Well, first of all, you should only be looping from ChartBars.FromIndex to ChartBars.ToIndex. Second, you should ensure that you are not doing any "calculations" in OnRender - that should be pre-staged in OnBarUpdate or perhaps OnMarketData if that's truly necessary, and OnRender should only be displaying the final results. Those are the "lowest hanging fruit" - if you do those things, you're down to smaller things like re-using rather than re-instantiating SharpDX brushes and so forth.

See also: https://ninjatrader.com//support/hel...bars.fromindex

Go through that page and study those recommendations - they're practical advice.

[Magzor]

Thanks again Bruce, using the FromIndex / ToIndex did the trick!!