Web applications become unusably slow and unresponsive as codebases grow without performance oversight

Developers and companies ship web applications that degrade into sluggish, stuttering experiences on standard hardware due to poor code quality, lack of performance testing, and bloated dependencies. Users experience 20-80% CPU usage on idle pages, screen tearing, and multi-second input lag, forcing them to abandon sites or switch to competitors. Current development practices lack automated performance gates and testing frameworks that catch these regressions before production.