Jitsi Android SDK taking to load first time for calling to users

We are using Jitsi Android SDK, when we call to someone using firebase notification, remote users notify that someone is calling you, user get the same room ID and join the call using the Wrapper.
from this time, to last when two participants joined, it is taking time to 10 seconds almost.
Can we reduce it? How we can start the video call immediately? Any clue?