I don't think the commands being sent generate that much bandwidth, the commands are either SIZE <filename> or MLST <filename>, this is a few bytes perhaps an average of 30 bytes per command + reply, for 100 files that's only a few kilobytes.
Sending the additional command could slow things down when there is extremely high latency between you and the FTP server, for instance if it takes 500ms for the server to receive the command and send a reply then over the course of sending say 100 files there is a total delay of 25 seconds.
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