allout-widgets-last-decoration-timing is a variable defined in `allout-widgets.el'.
Its value is

  • Automatically becomes buffer-local when set.

Timing details for the last cooperative decoration action.

This is maintained when `allout-widgets-time-decoration-activity' is set.

The value is a list containing two elements:
- the elapsed time as a number of seconds
- the list of changes processed, a la `allout-widgets-changes-record'.

When active, the value is revised each time automatic decoration activity
happens in the buffer.