ofNoise is slow with a lot of particles

@vanderlin wrote:

Just making a sketch playing with ofNoise I didn’t realize how CPU intensive it is. Look at this simple example:

at around 120k particles we sink to about 40fps on a new macbook pro in using 0.9.8 and 0.10. I try a few ways to render but get about the same speed. If I comment out the noise we bring the fps right back up.

Curious what is a technique to speed this up? GPU? Create a texture and read pixel values?

Thoughts.

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