Random groups are asking for your gearscore, but you dont want a gigantic addon which will crush your performance and hooks into your ingame tooltip? Here is the solution: StrayScore.
It only loads and triggers while opening the character window or changing your equip while the character window is open. It will only display your personal Gearscore. The calculation is the same as in Taco-Tooltip (=Enchants are being ignored), which is based on a broken implementation of Gearscore-lite.
The code is dirty and hacked together, but it works pretty well?
Weakaura for inspecting:
WOTLK inspect GearScore calculator (GS): https://wago.io/OfcUVe8yr
_________________________________________________________________
Gearscore display for the character frame (Key: C)
-only calculated and refreshed if you open the character window or change equip while the character window is open, once. ("performance optimized")
-based on calculation from gearscore-lite (vanilla wotlk)
-same calculation as in TacoTip (enchants are not weighted / implementation is broken)