# Why Non-Composited Animation Audit Exists Scans CSS for transitions / animations on non-GPU properties (color, box-shadow, top/left). Finds the repaint-heavy ones. Author: J.A. Watte Published: April 23, 2026 Source: https://jwatte.com/blog/blog-tool-non-composited-animation-audit/ --- **TL;DR.** Core Web Vitals — LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1 — are a Google ranking factor. Field data (CrUX, 28-day rolling real-user) beats lab data for this reason. The **[Non-Composited Animation Audit](/tools/non-composited-animation-audit/)** is the audit you reach for when you already suspect a problem in this dimension and need a fast, copy-paste-able fix list. It reuses the same chrome as every other jwatte.com tool — deep-links from the mega analyzers, AI-prompt export, CSV/PDF/HTML download — but the checks it runs are narrow and specific to the dimension described above. > Parses CSS (inline