The sparkline is intended to show real-time data, if you have a SharePoint list which gets updated often, the sparkline is a good choice to show real-time data.
A few points about the sparkline:
- Intended to show real-time updates to SharePoint lists
- Can show the Minimum/Maximum/Average/Median/Sum/First/Last/Row Count/Unique values of a SharePoint list
- The sparkline draws a new data dot every 1 second, updates more frequent than very 1 second is not possible. User can adjust how often it read data from SharePoint
Here is an example: (see below example live)