There have been a few topics like this, but they are all 4 or 5 years old. Since then, Morroblivion has improved, and new computer hardware has been released. If there is a topic already like this, just direct me there, and I'll delete this post.
Anyway, my problem is with fps. While playing Morrowblivion, I get >100 fps constantly in Cyrodiil (I have a 144hz monitor), but the fps in Morrowind commonly drops to around 30. Other times it reaches 50-70. I have a Radeon r9 380x, 16 gb of ram, and an i5 4690k 3.5ghz quad core, so I shouldn't have much trouble.
My guess is that my Morrowind mods could be causing this since Morroblivion borrows resources from Morrowind installed on my computer. I installed my Morrowind mods long before I installed Morrowblivion. The mods were mainly graphical improvements (improved textures, MGE, etc). Could those be the cause of these very common fps drops, or is it something else? Is it fixable?