How do you find the response time using HA?
I currently have a few FLIC buttons using Alexa integration to manage lights when we don't feel like talking to Alexa. The initial lag can be a few seconds, which while not horrible isn't instantaneous.
Granted, it does take as long to say "Alexa, turn on the sink light" and have it illuminate as it does to click the button and have the light illuminate. Turning it off and on in the HA dashboard is instantaneous though.