diff --git a/NewLife.Core/Caching/Cache.cs b/NewLife.Core/Caching/Cache.cs
index ec1e03e2a..acda9d5be 100644
--- a/NewLife.Core/Caching/Cache.cs
+++ b/NewLife.Core/Caching/Cache.cs
@@ -36,6 +36,16 @@ public abstract class Cache : DisposeBase, ICache
     #region 构造
     /// <summary>构造函数</summary>
     protected Cache() => Name = GetType().Name.TrimEnd("Cache");
+
+    /// <summary>销毁。释放资源</summary>
+    /// <param name="disposing"></param>
+    protected override void Dispose(Boolean disposing)
+    {
+        base.Dispose(disposing);
+
+        _keys = null;
+        //_keys2 = null;
+    }
     #endregion
 
     #region 基础操作
@@ -367,12 +377,12 @@ public virtual Int64 Bench(Boolean rand = false, Int32 batch = 0)
 
         // 提前准备Keys，减少性能测试中的干扰
         var key = "bstr_";
-        var key2 = "bint_";
+        //var key2 = "bint_";
         var max = cpu > 64 ? cpu : 64;
         var maxTimes = times * max;
         if (!rand) maxTimes = max;
         _keys = new String[maxTimes];
-        _keys2 = new String[maxTimes];
+        //_keys2 = new String[maxTimes];
 
         var sb = new StringBuilder();
         for (var i = 0; i < _keys.Length; i++)
@@ -382,10 +392,10 @@ public virtual Int64 Bench(Boolean rand = false, Int32 batch = 0)
             sb.Append(i);
             _keys[i] = sb.ToString();
 
-            sb.Clear();
-            sb.Append(key2);
-            sb.Append(i);
-            _keys2[i] = sb.ToString();
+            //sb.Clear();
+            //sb.Append(key2);
+            //sb.Append(i);
+            //_keys2[i] = sb.ToString();
         }
 
         // 单线程
@@ -417,7 +427,7 @@ public virtual Int64 Bench(Boolean rand = false, Int32 batch = 0)
     protected virtual Int32 GetTimesPerThread(Boolean rand, Int32 batch) => 10_000;
 
     private String[]? _keys;
-    private String[]? _keys2;
+    //private String[]? _keys2;
     /// <summary>使用指定线程测试指定次数</summary>
     /// <param name="times">次数</param>
     /// <param name="threads">线程</param>
@@ -444,12 +454,12 @@ public virtual Int64 BenchOne(Int64 times, Int32 threads, Boolean rand, Int32 ba
         // 读取测试
         rs += BenchGet(_keys, times, threads, rand, batch);
 
+        // 累加测试
+        rs += BenchInc(_keys!, times, threads, rand, batch);
+
         // 删除测试
         rs += BenchRemove(_keys, times, threads, rand, batch);
 
-        // 累加测试
-        rs += BenchInc(_keys2!, times, threads, rand, batch);
-
         return rs;
     }
 
diff --git a/NewLife.Core/Caching/MemoryCache.cs b/NewLife.Core/Caching/MemoryCache.cs
index 70a4a631d..abf7f8753 100644
--- a/NewLife.Core/Caching/MemoryCache.cs
+++ b/NewLife.Core/Caching/MemoryCache.cs
@@ -17,7 +17,7 @@ public class KeyEventArgs : CancelEventArgs
     public String Key { get; set; } = null!;
 }
 
-/// <summary>默认字典缓存</summary>
+/// <summary>内存缓存。并行字典实现，峰值性能10亿ops</summary>
 public class MemoryCache : Cache
 {
     #region 属性
@@ -497,7 +497,22 @@ protected class CacheItem
         /// <summary>设置数值和过期时间</summary>
         /// <param name="value"></param>
         /// <param name="expire">过期时间，秒</param>
-        public void Set<T>(T value, Int32 expire) => Set(value, TimeSpan.FromSeconds(expire));
+        public void Set<T>(T value, Int32 expire)
+        {
+            var type = typeof(T);
+            TypeCode = type.GetTypeCode();
+
+            if (IsInt())
+                _valueLong = value.ToLong();
+            else
+                _value = value;
+
+            var now = VisitTime = Runtime.TickCount64;
+            if (expire <= 0)
+                ExpiredTime = Int64.MaxValue;
+            else
+                ExpiredTime = now + expire * 1000;
+        }
 
         /// <summary>设置数值和过期时间</summary>
         /// <param name="value"></param>
diff --git a/Test/Program.cs b/Test/Program.cs
index 23066063e..0486ee387 100644
--- a/Test/Program.cs
+++ b/Test/Program.cs
@@ -204,8 +204,12 @@ private static void Test3()
 
     private static void Test4()
     {
-        var v = Rand.NextBytes(32);
-        Console.WriteLine(v.ToBase64());
+        // 提升进程优先级
+        var p = Process.GetCurrentProcess();
+        p.PriorityClass = ProcessPriorityClass.High;
+
+        //var v = Rand.NextBytes(32);
+        //Console.WriteLine(v.ToBase64());
 
         ICache ch = null;
         //ICache ch = new DbCache();