@AGA001 Further to all above, I have verified that the door open/close notification arrives almost instantly and unfailingly to the app, just as it does to the hub. I believe this is proof that the...

@Wayne-TP No cellular or VPN connection involved. All testing done on a high performing LAN. The delay is only noticed if I wait for the status to change on the iPad screen. But the hub beeps...

Before anybody asks, my Ipad app version is 3.9.505

T110 sensor connected to an H100 hub, HW 1.0, FW 1.5.23 Build 241106 Rel. 093525. Connection is good RF wise. Sensor used to detect a garage door opening, which causes the hub to sound an alarm. This...