Disgaea D2 [BCAS20301]

No, the performance impact of this is basically 0 %. More cores is better for something like RPCS3.

Then I guess I really underestimated how much more powerful an Intel Core i5-7300HQ @ 2.5GHz is compared to my AMD FX-6100 Six-Core 3.30GHz.

If, as you say, one of the former's cores is twice as fast as one of the latter's, I'm picturing their rough "power" in these terms:

FX-6100: 1 + 1 + 1 + 1 + 1 + 1 = 6
i5-7300HQ: 2 + 2 + 2 + 2 = 8

Basically, in my uninformed point of view, the i5 has got 33% more "power"; and yet, even though it has fewer cores and it's paired with an inferior GPU, it can achieve twice the performance that I can get (and that's when I'm running at the lowest resolution vs. his 720p, otherwise it's more than double).

I'm sure there are a lot of factors I'm not considering though, but this is good to know.