# #performance Making things faster with evidence: profiling, caching, and knowing which number matters. > Canonical URL: https://sudohulk.com/tags/performance > Feed: https://sudohulk.com/tags/performance/rss.xml > Author: Vignesh Kumar A > Licence: CC BY 4.0. Quote freely, cite the canonical URL. --- ## Writing - [How PostgreSQL tells every connection its cache is stale](https://sudohulk.com/writing/postgres-cache-invalidation.md): Each PostgreSQL connection caches the catalog for itself. How a change is announced to all of them at commit through a shared ring, and what happens to a connection that falls behind. (2026-10-17; 19 min; part 5 of PostgreSQL internals, explained simply)