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Is there any maximum count of web worker that can be run at the same time? Thanks a lot.

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Yes and no. With Web Workers, there's no hard limit but you are limited by the available CPU and memory.

There's a rather large amount of CPU and memory overhead that comes with each worker so you can bring the machine to a grind if you spin off a lot of workers.

I'd say Web Workers are best used for "long running" background tasks of 100 milliseconds or more.

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The w3c doesn't mention any limitation (see http://www.w3.org/TR/workers/)

But it depends on what you are wanting to do, the limit will be the computer on which you will run the app (be kind with your users).

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