Make sure you are setting it up for success not failure. Like positioning. They do much better when you are crossing their field of view not walking directly at them. So corner mounting usually works about the best. Also your automation logic can have a lot to do with response time. Because the sensor’s are pretty darn fast but the processing then commands can be where you are seeing the lag. Like if you have super complicated piston’s in CoRE vrs a basic motion turn on in say SmartLighting. Also how the bulbs are connected. If through Hue you will automatically see more delay.
So in my office my one bulb that is connected right to the ST hub turns on instantly when i walk by the office, and the 2 connected bulbs take maybe half a second later. Sensor is seeing me walk by, not at it directly, and I am 20-30 feet away. Same for the Kitchen, 30 feet away I cross it and no more than 1 step before lights start coming on.
All my lighting is done in SmartLighting with very basic motion events that check mode and time of day.
So yea they are fast, just make sure you arent making things hard for them lol.
That said, I think the Iris motion sensors act as fast if not faster, and are cheaper… So I quit buying the ST sensors.