An option to overclock the emulated N64 CPU was just adden to Mupen64 FZ for Android. This is a proper overcklocking option, unlike counter factor, VI refresh and the “full frame rate” option of the core that never does anything.
This works like the proper overcklocking option in PJ64 as well. I think its the first time a Mupen build gets this feature. Is it possible this will be added to Mupen64 Plus next? Its the only thing missing from this core to make it feature complete.