There are abundant threads regarding this slowdown in TP, I've came across different solutions with various settings, Dolphin revisions, gfx backends, etc. and haven't been able to find a definitive answer. My guess is for this particular part of the game I'd suggest using various solutions provided as this has been a known issue since and it seems to have not been remedied as of yet, even if you have the greatest CPU from what I've read. I've heard people getting a fluctuating 25+ fps throughout this portion (I personally haven't played the game to see this) but I'm guessing there is no full 30 solid fps solution at the moment, heck much if and when the developers attends to this matter who knows. If there is such a remedy (Dolphin vers, backend, speed hacks, etc.) then someone do tell.
[color=#666666]MSI [/color][color=#ff9933]CX[/color][color=#666666]60[/color]
[color=#999999]i5-4200M @ 3.5Ghz [/color][color=#ff9933]turboboost[/color]
[color=#666666]N[/color][color=#999999]vidia GT720[/color][color=#ff9933]M[/color]
[color=#999999][color=#666666]1[/color] [/color][color=#ff9966]TB[/color] [color=#999999]HDD[/color]
[color=#666666]Windows[/color] [color=#ff9933]8.1[/color]
[color=#999999][color=#666666]Wii [/color]Pro Controller [/color][color=#ff9933]+[/color] [color=#999999]Mayflash adapter, Wii Mote [/color][color=#ff9933]x2[/color]
[color=#999999]i5-4200M @ 3.5Ghz [/color][color=#ff9933]turboboost[/color]
[color=#666666]N[/color][color=#999999]vidia GT720[/color][color=#ff9933]M[/color]
[color=#999999][color=#666666]1[/color] [/color][color=#ff9966]TB[/color] [color=#999999]HDD[/color]
[color=#666666]Windows[/color] [color=#ff9933]8.1[/color]
[color=#999999][color=#666666]Wii [/color]Pro Controller [/color][color=#ff9933]+[/color] [color=#999999]Mayflash adapter, Wii Mote [/color][color=#ff9933]x2[/color]