#performance

PostgreSQL 18 ships uuidv7() in core. It looks like a small convenience function. It is actually the end of a decade-long argument about UUID primary keys, and the numbers from a 200 million row table explain why. Migration path included, with the one gotcha around the timestamp you can extract.

Python 3.14 made the no-GIL build officially supported and the single-thread penalty dropped from 40 percent to single digits. I moved a CPU heavy ingestion service across. The 3x speedup on the hot path was real. So were the three bugs that only exist without the lock, and none of them showed up in tests.

The React Compiler is stable, on by default in new Next.js apps, and it makes most manual memoization redundant. I removed 212 useMemo and useCallback calls from a production app to find out whether that was true. It was, with four exceptions, and the exceptions say something about what those hooks were actually doing.