Valve exploring a custom shader compiler on Linux that leads to significantly higher frame rates than native code on Windows: https://www.forbes.com/sites/jasonevangelho/2019/07/11/valves-latest-linux-gaming-work-is-boosting-amd-vulkan-performance-by-up-to-44-percent/
(Shader compilers run during the game, so compilation time can make a big difference.)
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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!
Over a sufficiently long time horizon, all code you write is legacy code.
A cute systemd feature to get the system clock roughly correct: if the system time is before the compilation time of the systemd binary, it moves the clock forward to that time!
https://lwn.net/Articles/714355/