nrfutil dfu very slow compared to nrf connect dfu

[bds]

Using the same connectivity firmware, a dfu update using nrfutil takes about four times as long as the same update using nrf connect. I have to setup dfu updating in a production setup and need a command line driven dfu process. Any options to speed up nrfutil, or alternatives to nrfutil?

[bjorn-spockeli]

nrfutil uses the following conenction interval, min_conn_interval_ms = 15 and max_conn_interval_ms = 30. I think this is the default connection interval used by nRF Connect, but could you check? If the connection intervals are identical, then there might be some differences regarding how NRF Connect and nrfutil communicates with the connectivity firmware on the nRF5x device on the pc side.