Combination charts very slow

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I have noticed that combination charts can be extremely slow to redraw, rendering a model unusable, whereas exactly the same chart as a line chart has no performance issues.

I first noticed this with a combination chart that had two series — one area, one line — each with less than 1000 items. Any change, or even a screen redraw (e.g. by obscuring the Quantrix window with some other window momentarily) would lead to Quantrix becoming unresponsive (and pegging the CPU) for up to a minute. Simply changing the chart type to a line chart made the performance issue go away.

It’s not a particular problem with the area series type, as even a combination chart made up only of line series shows the problem. The problem isn’t noticeable with trivially small charts. With a couple of hundred items, a combination chart starts to be a little slow compared to a line chart, but not terribly. With 700 items, it’s obvious.

I’ve observed this with Quantrix 3.1 and 3.5 on Windows and Quantrix 3.5 on the Mac.

I’d appreciate it if you could look into this, as it’s a shame not to be able to use combination charts when you have to plot, for example, daily data over the course of a year.

Cheers, Paul.


Paul – The 3.6 update contains a fix for this issue. Please see this forum post for update instructions.


Thank you for bringing this to our attention.


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