Mojo Academy · Lesson

Rewriting the Hot Path in Mojo

Translate the bottleneck with fn and SIMD.

Translate the Hot Path

Now take that slow Python loop and rebuild it in Mojo. You keep the same logic but gain real performance from typed, compiled code. 🔧

Write the kernel as an fn function, not def. Required types let the compiler generate tight machine code for your hot loop.

fn sum_squares(data: List[Float64]) -> Float64:
    var total: Float64 = 0.0
    return total