5e:T4d5,

DynamicViewDistance adjust the View Distance based on Target FPS and Max Foreground FPS to get more consistent FPS.

You can find those settings in: Menu -> System -> Advanced

The addon checks the FPS every second. If the FPS are lower than Target FPS the View Distance is reduced. If the FPS hit the Max Foreground FPS the View Distance is increased.

Additional to View Distance, the Texture Filtering and parts of Environment Detail (lodObjectCullSize) are also changed, which leads to a further performance boost.
Environment Detail could not set directly because of an annoying flickering effect.

The addon only affects Base Settings not Raid and Battleground.

I recommend a range of 20 FPS.

For my 144Hz monitor I use
Target FPS => 80
Max Foreground FPS => 100

For a 60 Hz monitor I would use
Target FPS => 60
Max Foreground FPS => 80
Be aware that Vertical Sync must be disabled in this scenario.

5f: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.