diff --git a/Assets/YooAsset/Runtime/PatchSystem/PatchManifest.cs b/Assets/YooAsset/Runtime/PatchSystem/PatchManifest.cs
index 0a0c1ae..52f561e 100644
--- a/Assets/YooAsset/Runtime/PatchSystem/PatchManifest.cs
+++ b/Assets/YooAsset/Runtime/PatchSystem/PatchManifest.cs
@@ -1,6 +1,5 @@
 using System;
 using System.IO;
-using System.Text;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
@@ -407,10 +406,6 @@ namespace YooAsset
 			return manifest;
 		}
 
-
-		[ThreadStatic]
-		private static StringBuilder _cacheBuilder = new StringBuilder(1024);
-
 		/// <summary>
 		/// 生成Bundle文件的正式名称
 		/// </summary>
@@ -422,22 +417,12 @@ namespace YooAsset
 			}
 			else if (nameStype == 2)
 			{
-				_cacheBuilder.Clear();
-				_cacheBuilder.Append(fileHash);
-				_cacheBuilder.Append(".");
-				if (isRawFile)
-					_cacheBuilder.Append(YooAssetSettingsData.Setting.RawFileVariant);
-				else
-					_cacheBuilder.Append(YooAssetSettingsData.Setting.AssetBundleFileVariant);
-				return _cacheBuilder.ToString();
+				string fileExtension = isRawFile ? YooAssetSettingsData.Setting.RawFileVariant : YooAssetSettingsData.Setting.AssetBundleFileVariant;
+				return StringUtility.Format("{0}.{1}", fileHash, fileExtension);
 			}
 			else if (nameStype == 4)
 			{
-				_cacheBuilder.Clear();
-				_cacheBuilder.Append(fileHash);
-				_cacheBuilder.Append("_");
-				_cacheBuilder.Append(bundleName);
-				return _cacheBuilder.ToString();
+				return StringUtility.Format("{0}_{1}", fileHash, bundleName);
 			}
 			else
 			{
diff --git a/Assets/YooAsset/Runtime/Utility/YooHelper.cs b/Assets/YooAsset/Runtime/Utility/YooHelper.cs
index 4c53320..f7d7027 100644
--- a/Assets/YooAsset/Runtime/Utility/YooHelper.cs
+++ b/Assets/YooAsset/Runtime/Utility/YooHelper.cs
@@ -8,29 +8,19 @@ namespace YooAsset
 	/// </summary>
 	internal static class PathHelper
 	{
-		/// <summary>
-		/// 获取规范化的路径
-		/// </summary>
-		public static string GetRegularPath(string path)
-		{
-			return path.Replace('\\', '/').Replace("\\", "/"); //替换为Linux路径格式
-		}
-
-		/// <summary>
-		/// 获取文件所在的目录路径（Linux格式）
-		/// </summary>
-		public static string GetDirectory(string filePath)
-		{
-			string directory = Path.GetDirectoryName(filePath);
-			return GetRegularPath(directory);
-		}
+		private static string _buildinPath;
+		private static string _sandboxPath;
 
 		/// <summary>
 		/// 获取基于流文件夹的加载路径
 		/// </summary>
 		public static string MakeStreamingLoadPath(string path)
 		{
-			return StringUtility.Format("{0}/{1}/{2}", UnityEngine.Application.streamingAssetsPath, YooAssetSettings.StreamingAssetsBuildinFolder, path);
+			if (string.IsNullOrEmpty(_buildinPath))
+			{
+				_buildinPath = StringUtility.Format("{0}/{1}", UnityEngine.Application.streamingAssetsPath, YooAssetSettings.StreamingAssetsBuildinFolder);
+			}
+			return StringUtility.Format("{0}/{1}", _buildinPath, path);
 		}
 
 		/// <summary>
@@ -38,23 +28,36 @@ namespace YooAsset
 		/// </summary>
 		public static string MakePersistentLoadPath(string path)
 		{
-			string root = MakePersistentRootPath();
+			string root = GetPersistentRootPath();
 			return StringUtility.Format("{0}/{1}", root, path);
 		}
 
 		/// <summary>
 		/// 获取沙盒文件夹路径
 		/// </summary>
-		public static string MakePersistentRootPath()
+		public static string GetPersistentRootPath()
 		{
 #if UNITY_EDITOR
 			// 注意：为了方便调试查看，编辑器下把存储目录放到项目里
-			string projectPath = GetDirectory(UnityEngine.Application.dataPath);
-			return StringUtility.Format("{0}/Sandbox", projectPath);
+			if (string.IsNullOrEmpty(_sandboxPath))
+			{
+				string directory = Path.GetDirectoryName(UnityEngine.Application.dataPath);
+				string projectPath = GetRegularPath(directory);
+				_sandboxPath = StringUtility.Format("{0}/Sandbox", projectPath);
+			}
+			return _sandboxPath;
 #else
-			return StringUtility.Format("{0}/Sandbox", UnityEngine.Application.persistentDataPath);
+			if (string.IsNullOrEmpty(_sandboxPath))
+			{
+				_sandboxPath = StringUtility.Format("{0}/Sandbox", UnityEngine.Application.persistentDataPath);
+			}
+			return _sandboxPath;
 #endif
 		}
+		private static string GetRegularPath(string path)
+		{
+			return path.Replace('\\', '/').Replace("\\", "/"); //替换为Linux路径格式
+		}
 
 		/// <summary>
 		/// 获取WWW加载本地资源的路径
diff --git a/Assets/YooAsset/Runtime/Utility/YooUtility.cs b/Assets/YooAsset/Runtime/Utility/YooUtility.cs
index 36e5a7d..45a5b56 100644
--- a/Assets/YooAsset/Runtime/Utility/YooUtility.cs
+++ b/Assets/YooAsset/Runtime/Utility/YooUtility.cs
@@ -55,37 +55,6 @@ namespace YooAsset
 			return _cacheBuilder.ToString();
 		}
 
-		public static List<string> StringToStringList(string str, char separator)
-		{
-			List<string> result = new List<string>();
-			if (!String.IsNullOrEmpty(str))
-			{
-				string[] splits = str.Split(separator);
-				foreach (string split in splits)
-				{
-					string value = split.Trim(); //移除首尾空格
-					if (!String.IsNullOrEmpty(value))
-					{
-						result.Add(value);
-					}
-				}
-			}
-			return result;
-		}
-		public static bool StringToBool(string str)
-		{
-			int value = (int)Convert.ChangeType(str, typeof(int));
-			return value > 0;
-		}
-		public static T NameToEnum<T>(string name)
-		{
-			if (Enum.IsDefined(typeof(T), name) == false)
-			{
-				throw new ArgumentException($"Enum {typeof(T)} is not defined name {name}");
-			}
-			return (T)Enum.Parse(typeof(T), name);
-		}
-
 		public static string RemoveFirstChar(string str)
 		{
 			if (string.IsNullOrEmpty(str))
diff --git a/Assets/YooAsset/Runtime/YooAssets.cs b/Assets/YooAsset/Runtime/YooAssets.cs
index 4eb96f9..4fce4f6 100644
--- a/Assets/YooAsset/Runtime/YooAssets.cs
+++ b/Assets/YooAsset/Runtime/YooAssets.cs
@@ -220,7 +220,7 @@ namespace YooAsset
 		/// </summary>
 		public static string GetSandboxRoot()
 		{
-			return PathHelper.MakePersistentRootPath();
+			return PathHelper.GetPersistentRootPath();
 		}
 
 		/// <summary>