How to saving and loading animation curves

Is there any way to save an animation curve by playerprefs ? The animation curves in the inspector reset each time the script is changed (public variables added)
I want record my animation In runtime as animation curve then I load It next time(same playerprefs I want save/load it)

using UnityEngine;
using System.Collections;

public class curvRecord : MonoBehaviour {
    public AnimationCurve xPositionCurve;
    public float timer = 0;
    public float recorder = 0;
    public bool play;
    public bool Reset;
    public bool record;


    void Update () {
        if (Reset && !play && ! record) {
            xPositionCurve.RemoveKey (5);
            play = false;
            recorder = 0;
            timer = 0;
        }
        if(play && timer<=recorder){
            record = false;  Reset = false;
            Vector3 localPosition = transform.position;
            localPosition.x = xPositionCurve.Evaluate (timer);
            transform.localPosition = localPosition;

            // Increase the timer by the time since last frame
            timer += Time.deltaTime;

        } else if(!play && record) {
            Reset = false;
            recorder += Time.deltaTime;
            xPositionCurve.AddKey (recorder, gameObject.transform.position.x);
        }
    }
}

I can record and play my curve animation but when I go exit from game reset curve animation.when I start game again I want load last curve animation

You can see my problem in this video:
videoLink

I have to use playerprefsX but when I use It in runtime I have lag In my game
please tell me what Is easiest way?!?!?! for saving animation curves
using UnityEngine;
using System.Collections;

public class curvRecord : MonoBehaviour {
    [SerializeField]
    public AnimationCurve xPositionCurve;
    public AnimationCurve yPositionCurve;
    public AnimationCurve zPositionCurve;
    public float timer = 0;
    public float recorder = 0;
    public bool record;
    public bool play;
    public bool Reset;
    public float[] CurveFrameValue;
    public bool OnceRunSaving;
    public bool OnceRunLoading;
    Keyframe[] ks = new Keyframe[500];

    void Start () {


    }

    void Saver(){
        for (int m = 0; m < CurveFrameValue.Length; m++) {
            CurveFrameValue [m] = xPositionCurve [m].value;
            PlayerPrefsX.SetFloatArray ("xpos", CurveFrameValue);
            print (m);
            }
    }

    // Update is called once per frame
    void Update () {
        if(OnceRunLoading){
            for (int n = 0; n < CurveFrameValue.Length; n++) {
                CurveFrameValue = PlayerPrefsX.GetFloatArray ("xpos");
                ks[n] = new Keyframe(n, CurveFrameValue[n]);
                xPositionCurve = new AnimationCurve(ks);
            }
            transform.position = new Vector3(Time.time, xPositionCurve.Evaluate(Time.time), 0);
            OnceRunLoading = false;
        }
        if (Reset && !play && !record) {
            xPositionCurve.RemoveKey (50);
            yPositionCurve.RemoveKey (50);
            zPositionCurve.RemoveKey (50);
            play = false;
            recorder = 0;
            timer = 0;
        }
        if(play && timer<=recorder){
            record = false;  Reset = false;
            Vector3 localPosition = transform.position;
            localPosition.x = xPositionCurve.Evaluate (timer);
            localPosition.y = yPositionCurve.Evaluate (timer);
            localPosition.z = zPositionCurve.Evaluate (timer);
            transform.localPosition = localPosition;

            // Increase the timer by the time since last frame
            timer += Time.deltaTime;
        } else if(!play && record) {
            timer = 0;
            Reset = false;
            recorder += Time.deltaTime;
            xPositionCurve.AddKey (recorder, gameObject.transform.position.x);
            yPositionCurve.AddKey (recorder, gameObject.transform.position.y);
            zPositionCurve.AddKey (recorder, gameObject.transform.position.z);
            if(!OnceRunSaving){
                Saver ();
                OnceRunSaving = true;
            }
        }else if(play && timer>=recorder){

            // Increase the timer by the time since last frame
            timer = 0;
        }
        else if(play && record) {
            Reset = true;
        }
        else if(Reset) {
            Reset = true;
        }
    }
}