Building a Signal Scheduler: Sync, Batch, Priority, and Lazy Execution

Short summary

Schedulers control when updates propagate in reactivity systems—a design choice impacting both performance and developer mental model. This article compares five core strategies: synchronous, batch, priority, lazy, and eager execution. React combines batch with priority; Vue uses deferred batching; Solid uses eager batching; each reflects distinct performance-consistency trade-offs for different use cases.

• •Scheduler strategy determines when effects run, directly affecting system performance and developer mental model
• •Five core approaches: sync (immediate), batch (merged per tick), priority (deadline-based), lazy (pull-based), eager (push-based)
• •Different frameworks optimize for different scenarios—React prioritizes interaction responsiveness; Vue prioritizes simplicity; Solid prioritizes raw performance

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