OnINBOX scans the emails as they come in and takes a few seconds for the email to be processed and sent back into your inbox. In the rarest of cases an email can be delayed for up to 2 minutes. These rare cases are caused by Google/Microsoft not sending us a timely notification of a new email coming in.
We are constantly making improvements to the performance of OnINBOX and its processing times. We have continuous monitoring on our side of how the product is performing and have people actively monitoring for any issues.
If you are experiencing any issues please reach out to us using the live chat.