Line chart: P50 page load time dropped from 4.2s in Jan to 2.1s in Mar.
Fig 1. P50 page load time, January–March 2025. Source: our RUM beacon. 

const sum = nums.reduce((a, b) => a + b, 0);
Reduce-based sum of a number array.

Premature optimization is the root of all evil.

— Donald Knuth, Structured Programming with go to Statements, 1974