Web Workers & Multi-Threading Visualizer

Compare Main Thread blocking vs offloaded Web Worker background processing.

UI Animation Counter:0

Main Thread (UI & JS Runtime)

Single-Threaded

Running heavy synchronous loops on the Main Thread blocks event handling, rendering, and causes UI stutter/freezes.

Dedicated Web Worker Thread

Parallel Background Thread

Web Workers run tasks in a separate background thread via structured clone message passing without freezing the UI.

Thread Communication Stream
›Main Thread initialized.
›Worker Thread initialized via web worker blob.