reminder for later

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+Some of the things git-annex transferkeys does are suboptimal, especially
+when -J has many of them running.
+
+In particular, it writes location logs when downloading (but not
+uploading), and so it flushes the journal etc.
+
+It may also do some queries of data from git that could be avoided with
+some refactoring of what code runs in it, which could avoid it needing to
+start up git helper processes like catkey. --[[Joey]]