#serializablecheck

Redux Toolkit 2.x serializableCheck middleware traversal cost boundary in large state trees

Performance boundary question The default serializableCheck middleware in Redux Toolkit 2.x runs a depth‑first traversal of the entire state tree on every dispatch in development mode. For state trees exceeding 10,000 nodes this traversal can become a measurable main‑thread bottleneck, yet the exact dispatch‑latency contribution remains unclear. The ignoredP