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remote fs transfers 4K for each file to do local mime resolution. Unix utility file can do the same job remotely without need of transfer for most extension based mime resolvers. I.e. we can provide magic which mimics NB mime-resolution file and transfer it to remote hosts
see previous improvements in issue #199136 - RemoteFS.getMimeType is slow
next release
One of the ideas is: use fs_server for reading these 4K fragments. Another one is: move logic to an utility on remote server.
Until we get measurements that show slowness caused by this fact, I'm downgrading this to P4. In theory, reducing these 4k transfers is right thing to do. In practice, there is no evidence that this is in the top 20% of the list. (It's more likely that something related with the remote VCS will get there)