Unity Benchmark for FindXxxx Method. refer : http://baba-s.hatenablog.com/entry/2014/07/09/093240

FindTest.cs

using System;
using UnityEngine;

/// <summary>
/// Find 関数の処理速度を計測するスクリプト
/// </summary>
public sealed class FindTest : MonoBehaviour
{
    public int LoopCount = 1000; // 1 回のテストで Find 関数を実行する回数
    public int TestCount = 10;   // テストの回数
    public int NumGameObjects = 100;  // 検索対象のオブジェクトの数

    /// <summary>
    /// ゲーム開始時に指定された数分のオブジェクトを生成します
    /// </summary>
    private void Awake()
    {
        var types = new PrimitiveType[]
        {
            PrimitiveType.Capsule,
            PrimitiveType.Cube,
            PrimitiveType.Cylinder,
            PrimitiveType.Plane,
            PrimitiveType.Quad,
            PrimitiveType.Sphere,
        };

        for (int i = 0; i < NumGameObjects; i++)
        {
            GameObject.CreatePrimitive(types[UnityEngine.Random.Range(0, types.Length)]);
        }
    }

    /// <summary>
    /// Find, FindGameObjectWithTag, FindObjectOfType 関数を実行するボタンを表示します
    /// </summary>
    private void OnGUI()
    {
        DrawButton(0, "Find", () => GameObject.Find("Player"));
        DrawButton(100, "FindGameObjectWithTag", () => GameObject.FindGameObjectWithTag("Player"));
        DrawButton(200, "FindObjectOfType", () => GameObject.FindObjectOfType<BoxCollider>());
    }

    /// <summary>
    /// 指定された関数を実行するボタンを表示します
    /// </summary>
    private void DrawButton(float buttonY, string buttonText, Action findAct)
    {
        if (GUI.Button(new Rect(0, buttonY, Screen.width, 100), buttonText))
        {
            var sum = 0f;
            for (int i = 0; i < TestCount; i++)
            {
                var time = Time.realtimeSinceStartup;
                for (int j = 0; j < LoopCount; j++)
                {
                    findAct();
                }
                time = Time.realtimeSinceStartup - time;
                sum += time;
            }
            var avg = sum / TestCount;
            Debug.Log(buttonText + ":" + avg + "sec");
        }
    }
}

Box Environment

Components	Value
OS	Windows 10 Pro 64bit (build 14393.223)
CPU	Core-i7 6700 @3.40GHz
Memory	32GB
GPU	GeForce 960

100 Objects

Unity Version	Method	LoopCount (1000)	LoopCount (10000)	LoopCount (100000)
5.4.0f3	Find	0.003656673sec	0.03624649sec	0.3626404sec
5.4.0f3	FindGameObjectWithTag	0.0001605987sec	0.00154953sec	0.01507263sec
5.4.0f3	FindObjectOfType	0.0658863sec	0.6607682sec	6.645772sec

1000 Objects

Unity Version	Method	LoopCount (1000)	LoopCount (10000)	LoopCount (100000)
5.4.0f3	Find	0.05269825sec	0.5394229sec	5.437216sec
5.4.0f3	FindGameObjectWithTag	0.0001548767sec	0.001549721sec	0.01499329sec
5.4.0f3	FindObjectOfType	0.1582977sec	1.623504sec	16.05754sec

10000 Objects

Unity Version	Method	LoopCount (1000)	LoopCount (10000)
5.4.0f3	Find	0.8089469sec	8.789804sec
5.4.0f3	FindGameObjectWithTag	0.0001621246sec	0.00146637sec
5.4.0f3	FindObjectOfType	2.337319sec	24.55924sec