No field should be hard for anyone to see if game is set to lowest graphics setting. If that is the case, that is a map maker error and should be corrected.
The making of Karelia was stretching the capabilities of the Terrain Editor to its limits
and beyond. The Terrain Editor doesn't use similar optimizing systems that are used on the Main Arenas, all of the handcrafted details have always been quite heavy even for high end gaming computers.