How React Works (Part 2)? Why React Had to Build Its Own Execution Engine

Why React Had to Build Its Own Execution Engine Series: How React Works Under the Hood Part 1: Motivation Behind React Fiber: Time Slicing & Suspense Prerequisites: Read Part 1 first — this article picks up exactly where it left off. Where We Left Off In Part 1 we landed on one sentence that explains why React had to be completely rewritten: React needs to be able to interrupt what it's doing and resume it later. Time Slicing needs it — to yield within the browser's 16ms frame budget. Suspen