Re: [w3c/ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

FWIW, I think I have run across an actual case where multiple service worker threads could offer a performance boost:

https://bugs.chromium.org/p/chromium/issues/detail?id=1293176#c11

Here someone is loading a dev environment with unbundled modules.  Its hitting the SW with 1000+ requests on load.  From tracing it appears the SW thread is being maxed out and becoming a bottleneck.

Just offering this as a data point as to when it might make sense to do this from a performance angle.

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