The slowed-down tempo (often reduced by 10–20%) combined with heavy reverb creates a "wall of sound" effect that emphasizes the track's dark-wave and retrowave roots.
The lyrics describe a profound, almost otherworldly infatuation with a "strange girl". Mareux The Perfect Girl Slowed Reverb
"You're such a strange girl / I think you come from another world..." The slowed-down tempo (often reduced by 10–20%) combined
The reduction in speed stretches the synth pads, giving them a more ominous and grander presence. Mareux The Perfect Girl Slowed Reverb