When I run nix flake update on my deploy-rs configuration, it usually downloads nixos-unstable, about 37MB.
After the download completes, it still sits there for several tens of seconds. What is it doing?
It’s certainly unpacking a 60k files / directories in the store (approx 320 MB)
and if you enabled auto-store-optimise in nix, it will check for duplicate for each of these 60 k files with other files in the store.
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Would be nice if it unpacked while downloading.
And of course even nicer if it only downloaded the diff 
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Pass a couple -vvvvvs and find out.
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Didn’t think of that.
Indeed, the lag is caused by unpacking and linking. Solved
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