Delayed notifications are a sign that your Ring device and Ring app is send you alerts as intended, however, connection may be slowing them down. Please ensure there is not a VPN enabled on your mobile device. If you are using an android device, check for any android apps that conflict with the Ring app.
If the above and prior suggestions in this thread do not help to resolve this concern, please give our support team a call at one of the numbers available here. If you are outside of the US, please visit here to see how to contact support. 