Using MTP to the SD Card I get under 0.8 M Bytes per second.
Using an €8 SD card USB reader I get 12 MB/sec or more copying from an HDD.
Turn off the tablet before removing or inserting a card, not just sleep.
Also for any device with an SD card don't copy content before using with calibre or it will take a long time. Create the folders (directories) you need and then connect to Calibre. Untick everywhere except folders that Calibre will use. Add rules for azw3, kfx, pdf, epub etc to appropriate directories and make sure default is memory card (will need changed back for devices not using a card),
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