Original code for Eyecandy X is fully based on Ultimate Eyecandy: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=672248733.
Full credit to Judazz.

Eyecandy X is a modified version of Ultimate Eyecandy that aims to improve performance and fix various issues.

While I tried to salvage this mod, it's almost impossible without starting from scratch. This doesn't mean the mod is unstable, but it might not be the best choice. Instead, I highly recommend considering alternatives like Lumina or Render It! which are built from the ground up.

The latest update, released on November 1st, is likely the final update for this mod. It includes a feature to save the Simulation Speed option and addresses an "issue" that was originally intentional in Ultimate Eyecandy, which involved hiding local LUTs, and as a result, hiding the 'Dark' and other LUTs added after 2018.

Every preset option is stored in a local file named "ECXPref.ecx" located at: C:\Program Files (x86)\Steam\steamapps\common\Cities_Skylines. You can also manually edit this file if you prefer.