Efficiency measures how effective your use of vision tool is. Are you maximizing use of your warding trinket and placing Control Wards in a timely manner? Multiple Control Wards only count after the others have been used.
Vision tools include:
- Warding Totem
- Sweeping Lens (becomes Oracle Alteration)
- Farsight Alteration)
This score is neutral (gray) because sometimes it's advantageous to hold onto a ward, and we can't measure that context.
To increase this score, place more wards more often. If you're constantly sitting at 2 charges, you're wasting potential ward placements that could be saving your life