Since it hasn't been mentioned yet, are you using the latest dev build of Dolphin? There have been a lot of changes and optimizations (as well as increased accuracy which in some cases may be slower), but that could help getting you closer to fullspeed.
But if that doesn't work, since you're using an i3-4030U @ 1.9 GHz, it doesn't have Turbo Boost so not even a program like ThrottleStop will help. In that case, the only thing that will help is by getting a faster CPU. And since the i3-4030U is a BGA processor, that means it's soldered to the motherboard so you can't change it, and you'll need to get a better computer.
But if that doesn't work, since you're using an i3-4030U @ 1.9 GHz, it doesn't have Turbo Boost so not even a program like ThrottleStop will help. In that case, the only thing that will help is by getting a faster CPU. And since the i3-4030U is a BGA processor, that means it's soldered to the motherboard so you can't change it, and you'll need to get a better computer.