 Max performed "Sweet but Psycho" on the January 23, 2019 episode of "The Late Late Show with James Corden", which was the song's American television debut.She wore a pearl white corset and tulle skirt which covered her jet-black leather pants, while the background lighting alternated between blue and red as the four catsuit-wearing dancers performed a synchronized shoulder shrug.On January 25, 2019, she performed the single on "Today".