Dongle initialization takes more than 1.5 seconds

I have noticed that the function sd_rpc_open(...) of  pc-ble-driver  takes more than 1.5 seconds. 

I have tried an example  heart_rate_monitor  which is supplied with pc-ble-driver and this example has the same performance problem with sd_rpc_open(...). 

We use Nordic Laird dongle in multiple applications and we need often to release and reinit the dongle to be accessible from multiple applications and such delay makes a performance problem.  

Can this time be reduced in any way?

NRF_SD_BLE_API = 3, if it is important.