A 2017 mbp should have zero problems with running wind waker.
Try disabling the texture pack? And I have no idea what the "modded WindWaker HD Version" does - is it a patch? Cheat codes? Something else? Perhaps that is affecting performance - I've never ran a modified WW game....
EDIT:
Any reason you're not using the latest -dev builds? 5.0 'stable' is pretty old, and a number of improvements have happened since then... For the most part, dolphin development has a stable development head (things aren't merged until they're "ready" - but mistakes occasionally happen...)
Try disabling the texture pack? And I have no idea what the "modded WindWaker HD Version" does - is it a patch? Cheat codes? Something else? Perhaps that is affecting performance - I've never ran a modified WW game....
EDIT:
Any reason you're not using the latest -dev builds? 5.0 'stable' is pretty old, and a number of improvements have happened since then... For the most part, dolphin development has a stable development head (things aren't merged until they're "ready" - but mistakes occasionally happen...)