Much confusion in the comments. Tl;dr: cache is "slow" because the number of ongoing requests-- including to cache! --are throttled by the browser. I.e the cac

Much confusion in the comments. Tl;dr: cache is "slow" because the number of ongoing requests-- including to cache! --are throttled by the browser. I.e the cache isn't slow, but reading it is waited upon and the network request might be ahead in the queue.