Go 1.10 has a number of dev performance improvements. One interesting unusual choice is that 'go test' caches the test result: https://golang.org/doc/go1.10#test
If you run the same passing tests on the same binary, you just get the cached output by default. Perf vs flakiness.
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I've now worked on several systems where the JSON was so big that avoiding pretty-printing was a performance win!
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Difftastic 0.71 is out! This is a polish release, still well worth upgrading:
* A ton of performance improvements, especially for nasty corner cases.
* Improved C++, Dockerfile, Haskell, JavaScript, Makefile, Perl, Ruby, Rust, Scala and TypeScript.
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I've been experimenting with LLM autoresearch. I prompted Sol to make difftastic faster without changing output on the test suite, and log everything it tried:
https://github.com/Wilfred/difftastic/blob/c6e9c6fed4c71276a8b0e377c92695c3d929dc7f/PERF_RESEARCH_LOG.md
It found some interesting performance tweaks, although it's too tolerant of complexity.