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TrueSpeed

A lightweight World of Warcraft addon that measures your character's actual movement speed from map coordinates, rather than reading the game's reported speed. This means it works correctly in situations where the API lies — most notably flight paths, where GetUnitSpeed("player") returns a fixed value.

Features

Real-time speed display in yards/sec, % of base run speed, and optionally knots
Works on flight paths, taxis, vehicles, and anywhere the standard speed API fails
Side-by-side comparison with the game's API-reported speed (toggleable)
Color-coded readout so you can tell mount tiers apart at a glance
Movable, scalable frame with a right-click options menu
Auto-hides inside instances (raids, dungeons, battlegrounds)
Configurable sampling rate and smoothing window for the trade-off between responsiveness and stability

5a:T459,The MIT License Copyright (c) <year> <copyright holders> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.