Resolving Main Thread Blocking with Web Workers: Image Color Extraction Time Reduced from 1s to 70ms

·2022.03.24 09:00

Key point

For 1500x1500 image color extraction, distributing the workload across 16 workers reduced the completion time per worker to 69.89ms, compared to 1016.70ms when processed solely on the main thread.

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Details

Converting image pixel data to RGB values using the Canvas API and aggregating them into a Set data structure can cause main thread blocking. To address this, Web Workers were used to offload computations to background threads. On an Intel Core i9 processor, processing a 1500x1500 image took 1016.70ms when handled solely by the main thread, but splitting the task across 16 workers reduced the completion time per worker to 69.89ms. This confirms that it is possible to maintain main thread UI responsiveness while effectively reducing latency for heavy data processing.

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