Update performance.md

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It is much faster to concatenate them into a matrix,
as this will hit BLAS matrix-matrix multiplication, which is much faster than the equivalent sequence of matrix-vector multiplications.
The improvement is enough that it is worthwild allocating new memory to store them contiguously.
The improvement is enough that it is worthwhile allocating new memory to store them contiguously.
```julia
x_batch = reduce(hcat, xs)