GVMax does not delay the sending of SMS or notifications. Once GVMax receives the forwarded email it sends the notification. In your case the delay was probably caused on the email forwarding hoop or in the GTalk hoop.
The only time GVMax may cause a delay is if I get spammed with thousands of emails causing your forwarded email to be placed into a queue until GVMax can catch up. But that did not happen in your case (last time was a few weeks ago)