DFU over CDC ACM very slow

Hello

I am doing a bluetooth dongle and I added MCUBOOT with CDC ACM to be able to update my app. 

I find that the update takes a lot : 5+ min to update a 200kB application.

This is questionning me because I have an other bluetooth product with a nRF52840 too and I can do an update within 30s max by ble.

It would seem logic that USB dfu is faster than BLE.

Regards

Thibaud

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