Slow progress towards self-driving cars, despite early optimism: https://www.vox.com/future-perfect/2020/2/14/21063487/self-driving-cars-autonomous-vehicles-waymo-cruise-uber
(Human fatalities are 1 per 100,000,000 miles driven, and no manufacturer has driven that much yet!)
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It's really satisfying to use a profiler for the first time on a project. I always find a big performance win with only a small code change.
It's never the code that I expected to be slow, however!
I'm implementing an interpreter, and wondering how often I should check for interruptions (e.g. Ctrl-C).
I don't want to spend too much CPU time checking whether I've been interrupted, but I also want slow programs to stop promptly. It's tricky.
An ad hoc, informally-specified, bug-ridden, slow implementation of half of a text adventure game -- or as I like to call it, a compiler.