[w3c/ServiceWorker] cache.add will block the main thread, such as network bandwidth? (Issue #1650)

I thought it would  request resources when the main thread is idle.
![截屏2022-07-14 下午3 20 57](https://user-images.githubusercontent.com/19382362/178945916-2bd35950-183c-465a-acfd-8f0d2c89b17b.png)



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Received on Thursday, 14 July 2022 09:05:45 UTC