When does it trigger?

If any of these take 'long enough' (a quarter second? imagining there's some good UI research out there about how long after the user is waiting is good to start showing a progress wheel)

• Waiting for card to open/close
• Waiting to change tabs (and submenus in Edit)
• Waiting for Edit view to render (wait to show cards until edit render complete)
• Waiting after clicking Create/Save/Cancel/Delete
• Waiting for searchbar menu to appear
• Waiting for auto-complete in Pointer
• Waiting for recaptcha to appear

Where does it appear?

In the same place all the time?

• bottom-right
• top-center (like Google)
• in-place near whatever's happening

Near whatever you're waiting for?

On cards, in the card header?

On search/goto menu, temporarily replace magnifying glass? (similar to Firefox when it's autocompleting)

On auto-complete in Pointers, ??

Does this fully replace bottom-right notices?

??

Also see

disappear done after a few seconds