Possible performance issues in Friden's realm

I’ve noticed that when in Friden’s realm, my computer runs a good 6-8C hotter than in other realms - is there some kind of issue with the water effect or objects in that realm that causes this? The game has a habit of randomly spiking up 4-5C lately, but the undersea realm consistently runs up to 8 to 10 degrees Celsius higher than almost any other part of the game.