diff --git a/Wox.Infrastructure/Storage/WoxJsonStorage.cs b/Wox.Infrastructure/Storage/WoxJsonStorage.cs
index f117aee2299b..da0dbd073d74 100644
--- a/Wox.Infrastructure/Storage/WoxJsonStorage.cs
+++ b/Wox.Infrastructure/Storage/WoxJsonStorage.cs
@@ -7,7 +7,7 @@
 
 namespace Wox.Infrastructure.Storage
 {
-    class WoxJsonStorage<T> : JsonStrorage<T> where T : new()
+    public class WoxJsonStorage<T> : JsonStrorage<T> where T : new()
     {
         public WoxJsonStorage()
         {
@@ -18,4 +18,4 @@ public WoxJsonStorage()
             FilePath = Path.Combine(directoryPath, $"{filename}{FileSuffix}");
         }
     }
-}
+}
\ No newline at end of file
diff --git a/Wox.Plugin/Result.cs b/Wox.Plugin/Result.cs
index 2f7459170335..592bcac5c687 100644
--- a/Wox.Plugin/Result.cs
+++ b/Wox.Plugin/Result.cs
@@ -108,7 +108,7 @@ public Result() { }
         public object ContextData { get; set; }
 
         /// <summary>
-        /// Plugin ID that generate this result
+        /// Plugin ID that generated this result
         /// </summary>
         public string PluginID { get; internal set; }
     }
diff --git a/Wox/Storage/TopMostRecord.cs b/Wox/Storage/TopMostRecord.cs
index 4d33f91ebb37..5f940f21843f 100644
--- a/Wox/Storage/TopMostRecord.cs
+++ b/Wox/Storage/TopMostRecord.cs
@@ -1,47 +1,50 @@
 using System.Collections.Generic;
 using System.Linq;
-using Wox.Infrastructure.Storage;
+using Newtonsoft.Json;
 using Wox.Plugin;
 
 namespace Wox.Storage
 {
+    // todo this class is not thread safe.... but used from multiple threads.
     public class TopMostRecord
     {
-        public Dictionary<string, Record> records = new Dictionary<string, Record>();
+        [JsonProperty]
+        private Dictionary<string, Record> records = new Dictionary<string, Record>();
 
         internal bool IsTopMost(Result result)
         {
+            if (records.Count == 0)
+            {
+                return false;
+            }
+
+            // since this dictionary should be very small (or empty) going over it should be pretty fast. 
             return records.Any(o => o.Value.Title == result.Title
-                && o.Value.SubTitle == result.SubTitle
-                && o.Value.PluginID == result.PluginID
-                && o.Key == result.OriginQuery.RawQuery);
+                                     && o.Value.SubTitle == result.SubTitle
+                                     && o.Value.PluginID == result.PluginID
+                                     && o.Key == result.OriginQuery.RawQuery);
         }
 
         internal void Remove(Result result)
         {
-            if (records.ContainsKey(result.OriginQuery.RawQuery))
-            {
-                records.Remove(result.OriginQuery.RawQuery);
-            }
+            records.Remove(result.OriginQuery.RawQuery);
         }
 
         internal void AddOrUpdate(Result result)
         {
-            if (records.ContainsKey(result.OriginQuery.RawQuery))
-            {
-                records[result.OriginQuery.RawQuery].Title = result.Title;
-                records[result.OriginQuery.RawQuery].SubTitle = result.SubTitle;
-                records[result.OriginQuery.RawQuery].PluginID = result.PluginID;
-            }
-            else
+            var record = new Record
             {
-                records.Add(result.OriginQuery.RawQuery, new Record
-                {
-                    PluginID = result.PluginID,
-                    Title = result.Title,
-                    SubTitle = result.SubTitle
-                });
-            }
+                PluginID = result.PluginID,
+                Title = result.Title,
+                SubTitle = result.SubTitle
+            };
+            records[result.OriginQuery.RawQuery] = record;
+
+        }
+
+        public void Load(Dictionary<string, Record> dictionary)
+        {
+            records = dictionary;
         }
     }
 
diff --git a/Wox/Storage/UserSelectedRecord.cs b/Wox/Storage/UserSelectedRecord.cs
index 9005590410bc..ef8bf7f8ef3b 100644
--- a/Wox/Storage/UserSelectedRecord.cs
+++ b/Wox/Storage/UserSelectedRecord.cs
@@ -12,21 +12,23 @@ public class UserSelectedRecord
 
         public void Add(Result result)
         {
-            if (records.ContainsKey(result.ToString()))
+            var key = result.ToString();
+            if (records.TryGetValue(key, out int value))
             {
-                records[result.ToString()] += 1;
+                records[key] = value + 1;
             }
             else
             {
-                records.Add(result.ToString(), 1);
+                records.Add(key, 1);
+
             }
         }
 
         public int GetSelectedCount(Result result)
         {
-            if (records.ContainsKey(result.ToString()))
+            if (records.TryGetValue(result.ToString(), out int value))
             {
-                return records[result.ToString()];
+                return value;
             }
             return 0;
         }
diff --git a/Wox/ViewModel/MainViewModel.cs b/Wox/ViewModel/MainViewModel.cs
index 1a12d6c8ce11..153caa55db3b 100644
--- a/Wox/ViewModel/MainViewModel.cs
+++ b/Wox/ViewModel/MainViewModel.cs
@@ -419,6 +419,11 @@ private void QueryResults()
                                 UpdateResultView(results, plugin.Metadata, query);
                             }
                         });
+
+                        // this should happen once after all queries are done so progress bar should continue
+                        // until the end of all querying
+                        _queryHasReturn = true;
+                        ProgressBarVisibility = Visibility.Hidden;
                     }, _updateToken);
                 }
             }
@@ -627,9 +632,6 @@ public void Save()
         /// </summary>
         public void UpdateResultView(List<Result> list, PluginMetadata metadata, Query originQuery)
         {
-            _queryHasReturn = true;
-            ProgressBarVisibility = Visibility.Hidden;
-
             foreach (var result in list)
             {
                 if (_topMostRecord.IsTopMost(result))
diff --git a/Wox/ViewModel/ResultsViewModel.cs b/Wox/ViewModel/ResultsViewModel.cs
index 674923228ee1..1175cd8c3e31 100644
--- a/Wox/ViewModel/ResultsViewModel.cs
+++ b/Wox/ViewModel/ResultsViewModel.cs
@@ -155,7 +155,6 @@ private List<ResultViewModel> NewResults(List<Result> newRawResults, string resu
             // Find the same results in A (old results) and B (new newResults)          
             var sameResults = oldResults
                                 .Where(t1 => newResults.Any(x => x.Result.Equals(t1.Result)))
-                                .Select(t1 => t1)
                                 .ToList();
             
             // remove result of relative complement of B in A