Nrf connect 2.3.0 dfu a lot slower than nrf connect 2.2.1

[bds]

Nrf connect 2.3.0 is at least 4 times slower than nrf connect 2.2.1 when updating a device ota.

Is this expected?

Anyone with the same results?

[run_ar]

What connection interval are you getting with nRF connect 2.3.0? If you use an older sdk (not 15) the application most likely does not ask for a connection interval parameter update. So check if that is done as well.

[bds]

With both 2.2.1 and 2.3.0 I see:

DEBUG GAP_EVT_CONN_PARAM_UPDATE time:2018-05-03T09:13:39.025Z connHandle:0 connParams:[minConnInterval:30 maxConnInterval:30 slaveLatency:0 connSupTimeout:4000]

I suppose this means the connection interval is 30ms for both?

Could 2.3.0 send less packets for every connection interval?

[run_ar]

Could you check the MTU size as well?

[bds]

MTU is 23 in both cases. We're using SDK 12.1.0.