A Cartoon Intro to Fiber
summary
Explains that Fiber replaces React’s old reconciler with a new fiber data structure and cooperative scheduler that breaks rendering into interruptible units, uses requestIdleCallback and priorities so high-priority updates preempt low ones, and keeps commits atomic; demo shows keeping smooth motion at 60 frames per second while a heavy once-per-second update runs. Describes double buffering to reduce GC, ties to Servo/Rust/WebAssembly work, and that commits must complete unbroken.
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