https://0xax.dev/field-notes/ Notes about real performance issues I was hunting in production and in my own hobby projects: what I saw, what I tried, what didn't work, and what was actually in the end. en Tue, 18 Aug 2026 10:52:32 +0000 https://0xax.dev/field-notes/hss-mysql-latency-spikes/ https://0xax.dev/field-notes/hss-mysql-latency-spikes/ Sat, 04 Jul 2026 00:00:00 +0000 The road from a p99 of almost one second down to 30 milliseconds. Every layer I checked was innocent and pointed to the one below it, until there were no layers left to blame.