Design a secure authentication and authorization system for an enterprise Ionic app.

Optimization involves utilizing OnPush Change Detection, Lazy Loading, Virtual Scroll for long lists, and efficient Asset Management.

At a senior level, performance is about minimizing the main thread workload. This includes code-splitting (Lazy Loading) to reduce the initial bundle size, using Ionic's 'virtual-scroll' or 'cdk-virtual-scroll' to render only visible DOM elements in massive lists, and using Web Workers for heavy data processing. Additionally, optimizing the bridge communication between JS and Native is crucial.