getindex(A::AbstractArray, I...) slows down computations with array of type Array{Float64,2}

General Usage Performance
2

You are allocating a copy of the slice in your loop here. Use @views to make this non-allocating.

Much better to use a 1d array of static arrays for this kind of thing. For example:

using StaticArrays
points = fill(@SVector[1.0, 1.0], 50000)

function indexing(points)
    x = 0.0
    for i = 1:length(points)
        x += sum(points[i])
    end
    return x
end