I believe this is unrelated to the fabled "performance issue". In the level Circuit Circuit, get the ammo for the gun and hold the button to waste it all at once. You will see that there are noticeable lag spikes when firing. This may be related to how this version creates a new WAV player for each shot.
There's a sound on/off toggle in the game itself that I believe negates this issue, at the cost of making the game silent. Therefore the force sound off toggle doesn't help this case.
I believe this is unrelated to the fabled "performance issue". In the level Circuit Circuit, get the ammo for the gun and hold the button to waste it all at once. You will see that there are noticeable lag spikes when firing. This may be related to how this version creates a new WAV player for each shot.