Coding Perceptual Performance: Using CSS Layered Variables, Resource Hints, and Idle-Time JS for Sub-200ms Feels Yoo plus 2026-02-16 0 Perceptual Performance is about making your site feel instant — even when backend work or heavy assets... Read More Read more about Perceptual Performance: Using CSS Layered Variables, Resource Hints, and Idle-Time JS for Sub-200ms Feels
