This one is easy:
The background flare is causing your slowdown. Just skip EFB access from CPU (needed to pull stars) and no more slowdown.
EFB access is a nasty setting Dolphin can't handle well. Even simple and minor effects like the sun-glow in SMG or a glow from the safe room in the first village out of a window in RE4 which you actually can't see will cause severe slowdowns. Fixing EFB access would fix almost all major slowdowns in any game.
The background flare is causing your slowdown. Just skip EFB access from CPU (needed to pull stars) and no more slowdown.
EFB access is a nasty setting Dolphin can't handle well. Even simple and minor effects like the sun-glow in SMG or a glow from the safe room in the first village out of a window in RE4 which you actually can't see will cause severe slowdowns. Fixing EFB access would fix almost all major slowdowns in any game.