Wind Waker Lag

[BlueSpark]

So 10 days ago i bought a new hard disk for my pc because my old one din't work anymore. I managed to transfer all my Dolphin save states from the old to the new hard disk with a USB (good thing i made a backup). The problem now is that it lags too much during boss fights and fights with normal enemies. Now while I'm in Ganon's tower the lag is even worse.
The game ran perfectly on the old hard disk and I never had any issues.Also I din't change the configuration. The other games like Smash Bros Brawl and Pokemon Colosseum run fine without any problems. The problem just happens with Wind Waker.
Can someone help me?

[ExtremeDude2]

Your computer is on the slow side.

[Helios]

You probably changed a setting without realizing it, or something with your OS changed.

Beyond that we can't really help.

[BlueSpark]

Your computer is on the slow side.

Well it ran perfectly fine 20 days ago with no lag. I didn't get a new ram or graphic card just a hard disk. So why is it suddenly slow?

[KHg8m3r]

If you put in a new hard drive, did you reinstall Windows?