Hello @Choi Wenbin ,
welcome to this moderated Azure community forum.
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Please provide information about the steps you have taken, the guide you follow, and any errors you receive so fellow members can understand your question better.
This latency of the raw messages you experience is a bit uncommon although it's not clear what code you are using.
IoT Central uses an Azure IoT Hub underneath the covers and the response time is usually 'sub-second'.
It could be you user interface of Azure IoT Central is causing the delays.
Please check the raw data pages of your device instead of the dashboards.
Please test with the example seen in this blog post. It is referencing the IoT Hub but it also contains a DPS example in GitHub so it should work for IoT Central too.
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