How copying an int made my code 11 times faster https://medium.com/@robertgrosse/how-copying-an-int-made-my-code-11-times-faster-f76c66312e0f (JITs are criticised as black boxes, but LLVM can be subtle too)
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3
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.
1
I'm considering using WebP more: for example, my websites would load faster and browsers have supported it since 2020: https://caniuse.com/webp
That said, GitHub just added support in August 2025, so I suspect I'd still find use cases that don't work yet:
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Spent a bunch of time learning about text diffing algorithms this evening.
"Myers Algorithm" refers to a specific paper written by Eugene Myers, and he published faster algorithms later!