Topic
Low-level optimization work such as ahead-of-time and JIT compilation, workload-specific tuning and throughput measurement.
Spring Boot p99 latency climbed from 400 ms to 18 s at about 20% CPU when one 100-thread pool ran both API and database calls, a DEV Community post says. The team's fix was a separate executor for each resource, and the post says virtual threads would not have helped.
Reality
Linus Torvalds submitted Claude Code-assisted patches that lift synthetic page-cache reads 23-fold, to 304 million a second. He warned real workloads will gain far less, and reviewers have since reported a race condition.
Reality
More than 80 percent of HPCCG's CPU time sits in sparse matrix-vector multiply. A dev.to walkthrough moving that kernel to CUDA finds the matrix has to be flattened into CSR before any device code runs.
Reality
Discord staff engineer Lily Mara argues full rewrites regenerate bugs the old code had already fixed, so she replaces functionality one function at a time across the C ABI. The published transcript makes the case for the method before it shows a number.
Reality
Luu reports that minutes of prompting bought a 7% speedup on his own query workload. The cost curve behind it re-prices optimization backlogs and makes holdout discipline the scarce skill.
Reality