Help with Mupen64 (Retroarch)

[Genmu20]

When I play Ocarina of Time on the retroarch via mupen64, the game's resolution looks pixelated so I decide to raise the resolution and then reset; it manage to look detailed but at the cost of being laggy.

So what I need is to have the Mupen64's settings the same configure and type what have in project 64: Good resolution without lag.

I would be glad to hear some advice and answers to see if I can configure the Retroarch Mupen64's settings in the way I want.

BTW, here some pic to see what do I mean:

 

[pix07]

@Genmu20 https://www.maketecheasier.com/n64-emulation-retroarch-ultimate-guide/

Info about emulation and best cores.