I cannot find any way to configure this on the perspective component. Once it loads the view on a page it wont update the sparkline chart till I reload the view.
You can set the Time Range to Realtime, which has it’s own Polling option that will appear which functions like the Vision polling.
While in Historical mode, you may notice that the Start Date and End Date are expressions. By default, they utilize the now(0) expression which only evaluates once. But if you change the now(0) expression in both the Start and End date to something like now(1000) the beginning and end date will poll at a rate of one second.