NES emulation runs fine at 60hz with no lag
GB/GBC emulation runs fine at 60hz with no lag
SMS emulation runs fine at 60hz with no lag
GG emulation runs fine at 60hz with no lag
Neo Geo Pocket emulations sluggish but you can turn the bitrate higher to make the game run faster at the cost of loosing the audio
PC Engine/TG-16 emulation runs slow but turning the Time IRQ off on some games makes them run at actual speed does lag in some parts though
SNES emulation runs average though some old speed hacks that cannot be done these days sped up these games quite a bit