take a look at this release note of Publii 0.36.
Under “3. Rendering process” it says that only new files are copied to the preview folder.
However, I am not sure if that also applies for the synchronization.
I haven’t found more about this anywhere but I hope I could help you a bit.
Publii syncs only changed/added files to the destination server, so only first deploy can be longer than the other ones.
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