Exactly. Inline is just surprisingly much faster than a lookup by URL, which has to check “do I have this cached? What type (immutable, revalidate, &c. &c.)? No

Exactly. Inline is just surprisingly much faster than a lookup by URL, which has to check “do I have this cached? What type (immutable, revalidate, &c. &c.)? Now (if suitable) fetch it from the cache.” before it can get on with actually acting on the resource’s contents.