This is my experience as well. When I get anywhere near my Gravity (with the key fob in my pocket) it now instantly and reliably wakes up and unlocks. Love it!
However, if I’m away from the car — let’s say I’m in my house getting ready to leave, and want to use the app to precondition the interior temperature of the car — it can take as much as two to three minutes to wake the car so it’ll even receive the command. I know that doesnt sound like a lot of time, but it feels like an eternity whilst I‘m watching the spinner next to “Waking up” go round and round (to ensure the command is received in the first place).