Your motor/esc combo looks like a hobbywing clone. Firstly ensure you set the voltage cut off to 1S or 3.0v.
Is the booster you have like this:
If so, you need to take a positive and negative lead from the ESC battery terminals to the power input pins. I used an old servo lead with the signal pin removed. plug this into the booster, then plug the booster into a spre receiver port. Also plug in the servo and ESC lead into the receiver. Your ESC on/off switch becomes redundant, as the direct power from battery will power the receiver, so just leave it on and use the battery leads for on/off.
It will work and you will get 5v+ supply to your receiver and servo, so it won;t be slow. the key think is that teh ESC does not go into shutdown if the voltage cut-off is set to 2S as it is by default.
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