Stream Analytics not processing instantly, constant 5 second watermark

We are trying to process event driven icons on a dashboard (on/off/active) with IoT hub, stream analytics, and table storage. I cannot get the actual process to work under 6 seconds. Watermark for stream analytics is a constant 5 seconds. The website claims instant processing. https://azure.microsoft.com/en-us/services/stream-analytics/

I have setup stream analytics with a very simple query of storing the enqueued time into table storage. I made sure the event ordering times and out of order messages was all set to 0 seconds and drop. I did this with a new stream analytics deployment. Also used the max allowed SU of 6. I set the batch output to 1.

select IoTHub.ConnectionDeviceId as PartitionKey, IoTHub.ConnectionDeviceId as RowKey, IoTHub.EnqueuedTime As Value
into Output
from Input

I expect total processing to be under 1.5 seconds and the watermark to be under 100s of milliseconds.

The following alerts are recommended for monitoring the performance of your Stream Analytics job. These metrics should be evaluated every minute over the last 5-minute period.

Try increasing the number of SUs or parallelizing your query.

For more information on SUs, see Understand and adjust Streaming Units.

Hope this helps.