USB hub can't be the problem as metadata upload times to original Kobo are short using the hub.
No matter which USB port I use the metadata times are 14-17 minutes on the WiFi Kobo and it doesn't matter whether I'm uploading 5 books at a time or just one. Same time to remove a book as well.
I'm worried this may be a Kobo problem and nothing to do with Calibre and I'll have to do a reset of the device but I'll wait and see what Tim says first.
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