diff --git a/Flow.Launcher.Plugin/Result.cs b/Flow.Launcher.Plugin/Result.cs
index f2050cc9f..c6ca81cf3 100644
--- a/Flow.Launcher.Plugin/Result.cs
+++ b/Flow.Launcher.Plugin/Result.cs
@@ -157,27 +157,6 @@ namespace Flow.Launcher.Plugin
             }
         }
 
-        /// <inheritdoc />
-        public override bool Equals(object obj)
-        {
-            var r = obj as Result;
-
-            var equality = string.Equals(r?.Title, Title) &&
-                           string.Equals(r?.SubTitle, SubTitle) &&
-                           string.Equals(r?.AutoCompleteText, AutoCompleteText) &&
-                           string.Equals(r?.CopyText, CopyText) &&
-                           string.Equals(r?.IcoPath, IcoPath) &&
-                           TitleHighlightData == r.TitleHighlightData;
-
-            return equality;
-        }
-
-        /// <inheritdoc />
-        public override int GetHashCode()
-        {
-            return HashCode.Combine(Title, SubTitle, AutoCompleteText, CopyText, IcoPath);
-        }
-
         /// <inheritdoc />
         public override string ToString()
         {
diff --git a/Flow.Launcher/ViewModel/ResultsViewModel.cs b/Flow.Launcher/ViewModel/ResultsViewModel.cs
index 107372e01..c0e0b146d 100644
--- a/Flow.Launcher/ViewModel/ResultsViewModel.cs
+++ b/Flow.Launcher/ViewModel/ResultsViewModel.cs
@@ -182,7 +182,7 @@ namespace Flow.Launcher.ViewModel
         /// <summary>
         /// To avoid deadlock, this method should not called from main thread
         /// </summary>
-        public void AddResults(IEnumerable<ResultsForUpdate> resultsForUpdates, CancellationToken token, bool reselect = true)
+        public void AddResults(ICollection<ResultsForUpdate> resultsForUpdates, CancellationToken token, bool reselect = true)
         {
             var newResults = NewResults(resultsForUpdates);
 
@@ -228,12 +228,12 @@ namespace Flow.Launcher.ViewModel
                 .ToList();
         }
 
-        private List<ResultViewModel> NewResults(IEnumerable<ResultsForUpdate> resultsForUpdates)
+        private List<ResultViewModel> NewResults(ICollection<ResultsForUpdate> resultsForUpdates)
         {
             if (!resultsForUpdates.Any())
                 return Results;
 
-            return Results.Where(r => r != null && !resultsForUpdates.Any(u => u.ID == r.Result.PluginID))
+            return Results.Where(r => r != null && resultsForUpdates.All(u => u.ID != r.Result.PluginID))
                           .Concat(resultsForUpdates.SelectMany(u => u.Results, (u, r) => new ResultViewModel(r, _settings)))
                           .OrderByDescending(rv => rv.Result.Score)
                           .ToList();