Configuring alerts for Compliance Settings

I want to configure SCCM Compliance settings to be able to send out email alert in 5-10 mins when an configuration item's state changed to "Non-Compliant". I have made the following configuration;

1. Client Policy's polling interval change to 5 mins

2. Compliance Setting's "Schedule compliance evaluation" change to 5 mins

3. State message reporting cycle change to 5 mins

4. Configure Email Notification and Create Email Subscription for the alert

Following behavior are observed in SCCM

1. The "Compliance history of a configuration item" report is showing the configuration item change state between 5-10 mins (not fixed interval)

2. The email notification alerts are seen at the inbox between 30-90 mins.(not fixed interval either)

The SCCM is still unable to send email alert in 5-10 mins and the alert interval is inconsistent. Is there any other configuration that I miss out in order to enable SCCM to send out Non-compliant email alert in 5-10 mins?