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Rust is definitely used in Firefox, but Servo[0], which was going to be the replacement browser engine (or at least the testbed for that), was abandoned by Mozilla, in a limbo for some time and now under new stewardship.
On a meta-level, I think the story that people like to tell is that Mozilla chose increasing executive compensation rather than using the same money to keep the Servo (and people working on Rust itself) employed.
[0]: https://servo.org
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Scout Monitoring
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Difficult to draw conclusions with no code here.
An interesting thing they didn't mention is that Matplotlib's point-in-path code is actually already in C. So this isn't really a case of Rust being X times faster than Python, it's X times faster than some other C algorithm. That's probably why X is only ~4 (they don't actually give a single-thread comparison), instead of ~50.
https://github.com/matplotlib/matplotlib/blob/cb487f3c077c93...
I expect the Rust code is faster because that code is waaaaay more complicated than what they probably need (https://stackoverflow.com/q/11716268/265521) - e.g. it handles stroke widths.
IMO this result is not very interesting.
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scalene
Scalene: a high-performance, high-precision CPU, GPU, and memory profiler for Python with AI-powered optimization proposals
I really want to know what the optimizations might have looked like had they used a profiler like scalene [0] to find where the unnecessary copying was happening.
[0] https://github.com/plasma-umass/scalene
