I also get terrible fps in pre-rendered cutscenes with my eGPU enabled. (It got substantially worse after the 17 May update.) However, when I disable my eGPU and use my severely underpowered iGPU, my fps are way higher. This isn't a solution though, because my iGPU can't handle the actual gameplay.
I think it might have to do with the way the eGPU is being detected as a peripheral. I don't understand why peripherals are causing so much trouble for these games, though? Please tell me EA is working on a patch for this...
