According to Record and Analyze Workbook Performance
A performance recording workbook is a Tableau dashboard that contains three views: Timeline, Events, and Query.
The uppermost view in a performance recording dashboard shows the events that occurred during recording, arranged chronologically from left to right. The bottom axis shows elapsed time since Tableau started, in seconds.
I suppose your screenshot is Timeline view.
It's possible to have "idle time", If there is no operation during the period.
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It is likely the events in that time period are filtered out of the default view as "Other Events" if you remove that filter, do you see what is happening during this time?
Thanks for the reply, I do see all kinds of 'Other Events'....so it's not really 'idle.