The headline makes it sound like they did work to *improve* the performance of c...

		shay_ker on April 11, 2019 \| parent \| context \| favorite \| on: PostgreSQL Count() Performance Improvements The headline makes it sound like they did work to improve* the performance of count(*) in the postgres code, when that's not at all what the article is about. This post from Citus is far more informative: https://www.citusdata.com/blog/2016/10/12/count-performance/

+1. Citusdata article is much better.