What we need is improved performance on the emulator's side itself because in reality,it is a tad slow.
Tis' the sad truth. 
Must agree with you, yesterday I tried to play the old n64 version of Spiderman, that I used to play on computer when I was younger, for the nostalgia, and it was lagging a bit. It was not too slow, but the lag was annoying, so I started to play around with settings, and the only plugin that worked smooth was gln64, with the enhancements disabled, but the polygons started to glitch out with this plugin, and that was even more annoying. So I had to play the PS1 version, since it have a weaker hardware compared to the n64, it worked smooth as butter

But the worst is that Conker's Bad fur Day doesn't work well in any plugin, it is always below 30fps, and that is unplayable. I remember playing it well on may old Pentium III with a GeForce FX 5200 video card (it have some lag sometimes, but it was pretty smooth and very playable). Is that old Single Core x86 833mhz CPU better than the 1.2 ghz Dual Core ARM CPU my tab have? What about the over 10 years old GPU?
Well, point is. I already saw some people saying the plugin was a bit slow on some games even on high end machines (some "issues" on github), add that to the fact that the plugins mupen ae already have runs pretty slow on some games, and with lag on others, so thats the reason I said that I believe this one will only have full speed on recent, high end devices, and some games will probably still have issues with speed. But of course, I really, really hope to be wrong.