Google’s John Mueller said at the 15:36 minute mark into the last Google hangout from Friday that if you are moving to HTTPs, you should move your whole site all at once. He said don’t move it section by section or page by page, do it all at once because it helps Google know the whole site is moving.

In the past, Google said it is okay to move one page at a time but Google has also said switching URLs and going HTTPS is different and Google handles them differently.

John said “what I would do with a move to HTTPS is just move everything at once.” When you do this HTTPS change, Google does “try to process that a little faster” and doing the whole site helps Google understand this. If you do not do it all at once, John said “takes a lot longer and there is a bit more room for error.”

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Forum discussion at YouTube.