Manipulate flickering and consuming lots of CPU

I am new to Mathematica and was experimenting with a simply problem of plotting a tangent to a curve and being able to move the point at which the tangent is drawn using Manipulate. When I run the following, the cell flickers a lot and it also seems to consume a lot of CPU? Is there a way to avoid this?

Manipulate[
  Module[{f, x, y, dx, dy},

    dx = dy = 1;
    f[x_] := x^2;
    tangent[x_, y_] := {{x - dx, y - f'[x] dy}, {x + dx, y + f'[x] dy}};
    g = Graphics[Line @ tangent[x0, f[x0]], PlotRange -> {{-5, 5}, {-5, 5}}];
    p = Plot[f[x], {x, -5, 5}];
    Show[p, g]],
  {{x0, 2}, -4, 4}]

Comments

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plotting - Mathematica: 3D plot based on combined 2D graphs

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