Vector3.sqrMagnitude vs Vector3.magntiude

sqrMagnitude is 20% faster than magnitude.

magnitude: 0.862013
srqMagnitude: 0.689175

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Diagnostics;

public class MagVsSqrMag : MonoBehaviour
{

    void Start()
    {
        var C = 10000000f;
        var sw = new Stopwatch();
        var vec = new Vector3(Random.value, Random.value, Random.value);
        var r = 0f;
        for (var i = 0; i < C; i++)
        {
            sw.Start();
            r += vec.magnitude;
            sw.Stop();
        }
        UnityEngine.Debug.Log("magnitude:" + (sw.ElapsedTicks / C));
        sw.Reset();
        vec = new Vector3(Random.value, Random.value, Random.value);
        for (var i = 0; i < C; i++)
        {
            sw.Start();
            r += vec.sqrMagnitude;
            sw.Stop();
        }
        UnityEngine.Debug.Log("srqMagnitude:" + (sw.ElapsedTicks / C));

        UnityEngine.Debug.Log(r);
    }

}