Function par_add_scaled_slice_in_place 

pub fn par_add_scaled_slice_in_place<F: Field>(
    slice: &mut [F],
    other: &[F],
    s: F,
)

Adds other, scaled by s, to the mutable slice using packing, or slice += other * s.

Performance

For small slices, use add_scaled_slice_in_place. Requires the parallel feature.