War Story: We Ditched Angular 18 for Svelte 5 and Reduced Our 2026 Enterprise App Bundle Size by 58%

In Q3 2025, our 14-person frontend team stared down a 3.2MB initial bundle for our Angular 18 enterprise resource planning (ERP) app — a figure that triggered 4.7s first contentful paint (FCP) on mid-range mobile devices, cost us 12% of our trial user conversions, and left our Lighthouse performance score stuck at 38. Six months later, after migrating to Svelte 5, our production bundle shrank to 1.34MB (a 58% reduction), FCP dropped to 1.1s, Lighthouse hit 94, and we shipped 3 new features with