I agree. I see the same variability depending on location. I have ATT so it’s difficult for me to correlate well with Verizon signal strength.it’s a bit more than from phone to satellite to car. and the slowness is apparent with many manufacturers and this type of remote start app, it al depends on your phone service Signal level and the cars 4g signal level.
Genesis uses Verizon, at my home I get 1 bar on a good day on my verizon devices. At work I get 5 bars.
the difference is apparent as remote start at home can take 2-3 minutes. At work it takes about 30 seconds.