Dolphin runs slowly

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I hope this is the right forum...

So I have a problem with Dolphin, it runs very slowly and I don't know why. My System (look at signature) is in my opinion good enough, so that games should be run good enough. Do you have any tipps, which settings I should use? I tried a lot revisions of Dolphin, and every one showed the same result. =/ And it's with almost all games...

Thanks for help!