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Intensity Graph Faster when Transpose Array is ON

Hi !
I'm writing a code to control and display the images given by a 2048x2048 camera and I have found about something that really bothers me.

 

In the Intensity Graph Pannel that I use to display my images, there is an option "Transpose Array" when I right click on the graph. The funny thing is that when this option is ON, my program runs a lot faster  : at 15fps against 5fps when the option Transpose Array is OFF.

I'm guessing this comes from the way the intensity graph is filled but I was wondering if someone could tell me more about this.

I have made a simple example that reproduces the behavior. However, the sped up when you transpose the array is not as great as the one I observe with my camera. Maybe it is because the Image doesnt change in my small example...

I was wondering if this was a normal behavior and if there was any way to get my image un-transposed diplayed at the fast rate.

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I havn't difference

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