The new version of Analytics Designer Developer Handbook is available: version 12.1,
link
It includes the following updates:
New Input control API to get active selected members
New Performance best practice: Use Application.refreshData() to refresh multiple data sources
New Performance best practice: Pause each widget individually when you want to pause a group of widgets
New Keeping last saved values of dynamic variables in bookmark
New Planning: Publish and leave dialog and option to turn off the dialog
Updated Analytic application script performance popup
Hope you find them useful.