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reduce interrupt frequency in ray_shade #18
I'm working on a response to Wolf Vollprecht's Next Journal article, and I noticed when running benchmarks that
Making the change increases performance by 5x (see below). Presumably we could make a similar change to the multi core version, and to other places were interrupts are used, but I haven't checked that. I figure you might have opinions about how to do this, so I didn't want to spend too much time changing things before getting a sense for what you want.
I did also make a change to NEWS, but only because I've been asked to that in pull requests into other projects. Feel free to edit as you see fit (obviously).