diff --git a/Plugins/Flow.Launcher.Plugin.Program/Main.cs b/Plugins/Flow.Launcher.Plugin.Program/Main.cs
index 3b03f89f6..2622b16fa 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/Main.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/Main.cs
@@ -127,9 +127,16 @@ namespace Flow.Launcher.Plugin.Program
 
         public static async Task IndexProgramsAsync()
         {
-            var t1 = Task.Run(IndexWin32Programs);
-            var t2 = Task.Run(IndexUwpPrograms);
-            await Task.WhenAll(t1, t2).ConfigureAwait(false);
+            var a = Task.Run(() =>
+            {
+                Stopwatch.Normal("|Flow.Launcher.Plugin.Program.Main|Win32Program index cost", IndexWin32Programs);
+            });
+
+            var b = Task.Run(() =>
+            {
+                Stopwatch.Normal("|Flow.Launcher.Plugin.Program.Main|UWPProgram index cost", IndexUwpPrograms);
+            });
+            await Task.WhenAll(a, b).ConfigureAwait(false);
             _settings.LastIndexTime = DateTime.Today;
         }
 
diff --git a/Plugins/Flow.Launcher.Plugin.Program/Programs/Win32.cs b/Plugins/Flow.Launcher.Plugin.Program/Programs/Win32.cs
index deb297ca6..dc5407f1a 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/Programs/Win32.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/Programs/Win32.cs
@@ -246,7 +246,7 @@ namespace Flow.Launcher.Plugin.Program.Programs
                     if (extension == ExeExtension && File.Exists(target))
                     {
                         program.LnkResolvedPath = program.FullPath;
-                        program.FullPath = Path.GetFullPath(target).ToLower();
+                        program.FullPath = Path.GetFullPath(target).ToLowerInvariant();
                         program.ExecutableName = Path.GetFileName(target);
 
                         var description = _helper.description;
@@ -324,7 +324,7 @@ namespace Flow.Launcher.Plugin.Program.Programs
 
         private static string Extension(string path)
         {
-            var extension = Path.GetExtension(path)?.ToLower();
+            var extension = Path.GetExtension(path)?.ToLowerInvariant();
             if (!string.IsNullOrEmpty(extension))
             {
                 return extension.Substring(1);
@@ -489,7 +489,8 @@ namespace Flow.Launcher.Plugin.Program.Programs
 
         private static IEnumerable<Win32> ProgramsHasher(IEnumerable<Win32> programs)
         {
-            return programs.GroupBy(p => p.FullPath.ToLower())
+            return programs.GroupBy(p => p.FullPath.ToLowerInvariant())
+                .AsParallel()
                 .SelectMany(g =>
                 {
                     var temp = g.Where(g => !string.IsNullOrEmpty(g.Description)).ToList();
diff --git a/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs b/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs
index 4282eab06..fb32fb892 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs
@@ -1,7 +1,6 @@
 using System;
 using System.IO;
 using System.Text.Json.Serialization;
-using System.Windows.Media.Imaging;
 using Flow.Launcher.Plugin.Program.Programs;
 
 namespace Flow.Launcher.Plugin.Program.Views.Models