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Should only be lowered for an increase in stability, or if you'd like to see a more readable frame rate when Show FPS is enabled.
Shows the frames per second in the lower right side of the screen. If you wish to create a comment line inside the file, just place a semicolon ( ) at the beginning of the line and the game will not read it as instruction code. Losing an operating version of this file may require complete reinstallation of the game if you are not able to find a replacement from another source. Incorrect modifications to the file can cause the game to not run properly- or possibly at all. You should not delete this file, as Morrowind will not run without it, so backing up the file is very important. Warning! Make a backup copy of your Morrowind.ini (e.g., copy and rename the new file as Morrowind.bak) before you make any changes. In-game settings from the Options menu (Preferences, Audio, Controls, Video) are stored elsewhere in the computer's Windows registry and will be lost when reinstalling the operating system unless the settings are backed up!. Modifying it allows you to customize your game's behavior at a fundamental level.
This file houses some of the instructions and settings the game engine uses to build the game world- including lighting, water, & weather parameters, and links for asset archives or accessory game files (mods) to load. In the PC version of Morrowind there is a configuration file file called Morrowind.ini in the root directory of the game.