Nick Craig-Wood 402aaca7fe local: don't calculate any hashes by default #3419
Before this change, if the caller didn't provide a hint, we would
calculate all hashes for reads and writes.

The new whirlpool hash is particularly expensive and that has become noticeable.

Now we don't calculate any hashes on upload or download unless hints are provided.

This means that some operations may run slower and these will need to be discovered!

It does not affect anything calling operations.Copy which already puts
the corrects hints in.
2019-08-14 15:07:38 +01:00
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