Weighted histogram ~2x as slow in Julia vs. Python

General Usage Performance
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4

Try this:

function histSum(x::Array{Float64,}, y::Array{Float64,}, bins::Int=100)
    binMin, binMax = extrema(x)
    result = zeros(bins)
    α = bins / (binMax - binMin)
    for (x, y) in zip(x, y)
        i = min(bins, 1 + floor(Int, α * (x - binMin)))
        result[i] += y
    end
    return range(binMin, stop=binMax, length=bins+1), result
end
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