How do you architect AngularJS systems for deterministic performance under unpredictable load?

Deterministic performance is achieved by bounding digest cycles, controlling rendering scope, and limiting runtime complexity.

Predictable performance requires ensuring that UI execution time does not degrade under increased data or user load. AngularJS systems must enforce strict limits on watchers, avoid unbounded ng-repeat, and use pagination or virtualization. Digest cycles must be explicitly controlled using $applyAsync. Performance budgets are defined per module to guarantee predictable response times.