>>4944583516.6ms is 60fps, the emulator is actually outputing 60 frames per second... but taking twice as long since you slowed it down. It just doesn't know.
>what does the formula even doHave you tried reading it? It's just bullshit.
fps = 30*(1/x)
assuming fps = 60
60 = 30*(1/x)
x = 0.5
sets speed to 0.5
aka renders at 30fps