diff --git a/Plugins/Wox.Plugin.Program/Main.cs b/Plugins/Wox.Plugin.Program/Main.cs
index 87956af6c..0d855f421 100644
--- a/Plugins/Wox.Plugin.Program/Main.cs
+++ b/Plugins/Wox.Plugin.Program/Main.cs
@@ -42,7 +42,7 @@ private static void preloadPrograms()
             });
             Logger.WoxInfo($"Number of preload win32 programs <{_win32s.Length}>");
             Logger.WoxInfo($"Number of preload uwps <{_uwps.Length}>");
-        }   
+        }
 
         public void Save()
         {
@@ -55,11 +55,8 @@ public List<Result> Query(Query query)
         {
             Win32[] win32;
             UWP.Application[] uwps;
-            lock (IndexLock)
-            { // just take the reference inside the lock to eliminate query time issues.
-                win32 = _win32s;
-                uwps = _uwps;
-            }
+            win32 = _win32s;
+            uwps = _uwps;
 
             var results1 = win32.AsParallel()
                 .Where(p => p.Enabled)
@@ -109,10 +106,7 @@ public void loadSettings()
         public static void IndexWin32Programs()
         {
             var win32S = Win32.All(_settings);
-            lock (IndexLock)
-            {
-                _win32s = win32S;
-            }
+            _win32s = win32S;
         }
 
         public static void IndexUWPPrograms()
@@ -122,10 +116,7 @@ public static void IndexUWPPrograms()
 
             var applications = support ? UWP.All() : new UWP.Application[] { };
             //var applications = new UWP.Application[] { };
-            lock (IndexLock)
-            {
-                _uwps = applications;
-            }
+            _uwps = applications;
         }
 
         public static void IndexPrograms()
@@ -181,7 +172,7 @@ public List<Result> LoadContextMenus(Result selectedResult)
             return menuOptions;
         }
 
-        
+
         public static void StartProcess(Func<ProcessStartInfo, Process> runProcess, ProcessStartInfo info)
         {
             try
diff --git a/Wox/Converters/HighlightTextConverter.cs b/Wox/Converters/HighlightTextConverter.cs
index 2213eb9b3..bff2a98d6 100644
--- a/Wox/Converters/HighlightTextConverter.cs
+++ b/Wox/Converters/HighlightTextConverter.cs
@@ -9,18 +9,43 @@
 using System.Windows.Documents;
 using System.Windows.Media;
 using Wox.Core.Resource;
+using Wox.Infrastructure.UserSettings;
 
 namespace Wox.Converters
 {
+    internal class HightLightStyle
+    {
+        public Brush Color { get; set; }
+        public FontStyle FontStyle { get; set; }
+        public FontWeight FontWeight { get; set; }
+        public FontStretch FontStretch { get; set; }
+
+        internal HightLightStyle(bool selected)
+        {
+            var app = Application.Current as App;
+            Settings settings = app.Settings;
+            ResourceDictionary resources = app.Resources;
+
+            Color = (Brush)(selected ?
+                resources.Contains("ItemSelectedHighlightColor") ? resources["ItemSelectedHighlightColor"] : resources["BaseItemSelectedHighlightColor"] :
+                resources.Contains("ItemHighlightColor") ? resources["ItemHighlightColor"] : resources["BaseItemHighlightColor"]);
+            FontStyle = FontHelper.GetFontStyleFromInvariantStringOrNormal(settings.ResultHighlightFontStyle);
+            FontWeight = FontHelper.GetFontWeightFromInvariantStringOrNormal(settings.ResultHighlightFontWeight);
+            FontStretch = FontHelper.GetFontStretchFromInvariantStringOrNormal(settings.ResultHighlightFontStretch);
+        }
+
+    }
     public class HighlightTextConverter : IMultiValueConverter
     {
+        private static Lazy<HightLightStyle> _highLightStyle = new Lazy<HightLightStyle>(() => new HightLightStyle(false));
+        private static Lazy<HightLightStyle> _highLightSelectedStyle = new Lazy<HightLightStyle>(() => new HightLightStyle(true));
+
         public object Convert(object[] value, Type targetType, object parameter, CultureInfo cultureInfo)
         {
             var text = value[0] as string;
             var highlightData = value[1] as List<int>;
             var selected = value[2] as bool? == true;
 
-            var textBlock = new Span();
 
             if (highlightData == null || !highlightData.Any())
             {
@@ -28,16 +53,17 @@ public object Convert(object[] value, Type targetType, object parameter, Culture
                 return new Run(text);
             }
 
-            var settings = (Application.Current as App).Settings;
-            var resources = ThemeManager.Instance.GetResourceDictionary();
-
-            var highlightColor = (Brush) (selected?
-                resources.Contains("ItemSelectedHighlightColor")? resources["ItemSelectedHighlightColor"]: resources["BaseItemSelectedHighlightColor"]:
-                resources.Contains("ItemHighlightColor")? resources["ItemHighlightColor"]: resources["BaseItemHighlightColor"]);
-            var highlightStyle = FontHelper.GetFontStyleFromInvariantStringOrNormal(settings.ResultHighlightFontStyle);
-            var highlightWeight = FontHelper.GetFontWeightFromInvariantStringOrNormal(settings.ResultHighlightFontWeight);
-            var highlightStretch = FontHelper.GetFontStretchFromInvariantStringOrNormal(settings.ResultHighlightFontStretch);
-
+            HightLightStyle style;
+            if (selected)
+            {
+                style = _highLightSelectedStyle.Value;
+            }
+            else
+            {
+                style = _highLightStyle.Value;
+            }
+            
+            var textBlock = new Span();
             for (var i = 0; i < text.Length; i++)
             {
                 var currentCharacter = text.Substring(i, 1);
@@ -45,10 +71,10 @@ public object Convert(object[] value, Type targetType, object parameter, Culture
                 {
                     textBlock.Inlines.Add((new Run(currentCharacter)
                     {
-                        Foreground = highlightColor,
-                        FontWeight = highlightWeight,
-                        FontStyle = highlightStyle,
-                        FontStretch = highlightStretch
+                        Foreground = style.Color,
+                        FontWeight = style.FontWeight,
+                        FontStyle = style.FontStyle,
+                        FontStretch = style.FontStretch
                     }));
                 }
                 else
diff --git a/Wox/ViewModel/MainViewModel.cs b/Wox/ViewModel/MainViewModel.cs
index 7d4f28c35..8143fb8fd 100644
--- a/Wox/ViewModel/MainViewModel.cs
+++ b/Wox/ViewModel/MainViewModel.cs
@@ -472,23 +472,26 @@ private void QueryResults()
                         };
                         CountdownEvent countdown = new CountdownEvent(plugins.Count);
 
-                        Parallel.ForEach(plugins, plugin =>
+                        foreach (var plugin in plugins)
                         {
-                            if (token.IsCancellationRequested)
+                            Task.Run(() =>
                             {
-                                Logger.WoxTrace($"canceled {token.GetHashCode()} {Thread.CurrentThread.ManagedThreadId}  {queryText} {plugin.Metadata.Name}");
-                                countdown.Signal();
-                                return;
-                            }
-                            var results = PluginManager.QueryForPlugin(plugin, query);
-                            if (token.IsCancellationRequested)
-                            {
-                                Logger.WoxTrace($"canceled {token.GetHashCode()} {Thread.CurrentThread.ManagedThreadId}  {queryText} {plugin.Metadata.Name}");
-                                countdown.Signal();
-                                return;
-                            }
-                            _resultsQueue.Add(new ResultsForUpdate(results, plugin.Metadata, query, token, countdown));
-                        });
+                                if (token.IsCancellationRequested)
+                                {
+                                    Logger.WoxTrace($"canceled {token.GetHashCode()} {Thread.CurrentThread.ManagedThreadId}  {queryText} {plugin.Metadata.Name}");
+                                    countdown.Signal();
+                                    return;
+                                }
+                                var results = PluginManager.QueryForPlugin(plugin, query);
+                                if (token.IsCancellationRequested)
+                                {
+                                    Logger.WoxTrace($"canceled {token.GetHashCode()} {Thread.CurrentThread.ManagedThreadId}  {queryText} {plugin.Metadata.Name}");
+                                    countdown.Signal();
+                                    return;
+                                }
+                                _resultsQueue.Add(new ResultsForUpdate(results, plugin.Metadata, query, token, countdown));
+                            }, token);
+                        }
 
                         Task.Run(() =>
                         {