You'll notice
Useful2 Signal2
Creating a cloud session is quicker because it no longer waits on the file-seeding plan.
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What
When creating a cloud session, the decision to hold back your first message and send it after attaching no longer waits on the file-seeding plan to finish computing. It now uses values already computed at that point, removing a wait from the session-create path.
Evidence
withheldInitialMessage
Strings lifted out of the shipped bundle, so the claim above can be checked against them.