Hi @Jkwilson. For your individual smart lights that are connected to your Bridge and Transformer, the lights talk peer to peer with the motion signal from the smart lighting motion sensor going directly to the transformer through group activation, which is a very low latency. When the Doorbell is involved, the signal has to go to the wireless router, then to the cloud, back to the router, and back to the bridge, then the lights turn on. This process can cause a bit of a lag if you have a lot of devices connected to your router, all talking at the same time.
To have a better performance time, you will want to look into the connection that your Doorbell has to your router. You can learn more about that connection and RSSI in our Community post here. You will also want to look into what the RSSI for your Bridge is as well. The lower the RSSI, the faster that communication time will be. If you have a lot of devices connected to your wireless router, you may want to look into getting wifi extenders like the Eero system. Hope this helps clear it up for you!