Why are you making a PS3 emulator?

if powerhouses like Haswell i7s @ over 4 GHz aren't predicted to play heavy PS3 games when rpcs3 is capable

This is where you stop, realize this is a dumb blanket statement, that nobody has really predicted anything, and that prediction without evidence is stupid.

Great, now that we have that taken care of, we can stop discussing this at all, and instead reflect on the smooth, smooth sounds of Sexy Sax Man.

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and according to AlexAltea, the rpcs3 interpreter is not only horribly slow, it's even slower than what it could be.

It's not even the interpreter ATM, it's the memory manager, which is horrendously slow. Given that you can have many memory accesses per PPU instruction, it's not really a surprise that it tanks speed so much. It will be optimized in the future, though.

(The PPU interpreter just kind of sucks in general because there's a lot of spaghetti and indirection going on. It's not very cache-friendly at all, either.)