diff --git a/src/NzbDrone.Core/IndexerSearch/MoviesSearchService.cs b/src/NzbDrone.Core/IndexerSearch/MoviesSearchService.cs
index 7f86259c2e..f1ed4bd8dd 100644
--- a/src/NzbDrone.Core/IndexerSearch/MoviesSearchService.cs
+++ b/src/NzbDrone.Core/IndexerSearch/MoviesSearchService.cs
@@ -62,8 +62,8 @@ public void Execute(MissingMoviesSearchCommand message)
 
             var movies = _movieService.MoviesWithoutFiles(pagingSpec).Records.ToList();
 
-            var queue = _queueService.GetQueue().Where(q => q.Movie != null).Select(q => q.Movie.Id);
-            var missing = movies.Where(e => !queue.Contains(e.Id)).ToList();
+            var queuedMovieIds = new HashSet<int>(_queueService.GetQueue().Where(q => q.Movie != null).Select(q => q.Movie.Id));
+            var missing = movies.Where(e => !queuedMovieIds.Contains(e.Id)).ToList();
 
             SearchForBulkMovies(missing, message.Trigger == CommandTrigger.Manual).GetAwaiter().GetResult();
         }
@@ -82,8 +82,8 @@ public void Execute(CutoffUnmetMoviesSearchCommand message)
 
             var movies = _movieCutoffService.MoviesWhereCutoffUnmet(pagingSpec).Records.ToList();
 
-            var queue = _queueService.GetQueue().Where(q => q.Movie != null).Select(q => q.Movie.Id);
-            var missing = movies.Where(e => !queue.Contains(e.Id)).ToList();
+            var queuedMovieIds = new HashSet<int>(_queueService.GetQueue().Where(q => q.Movie != null).Select(q => q.Movie.Id));
+            var missing = movies.Where(e => !queuedMovieIds.Contains(e.Id)).ToList();
 
             SearchForBulkMovies(missing, message.Trigger == CommandTrigger.Manual).GetAwaiter().GetResult();
         }
diff --git a/src/NzbDrone.Core/Movies/MovieService.cs b/src/NzbDrone.Core/Movies/MovieService.cs
index 60242f938d..9a18da5edf 100644
--- a/src/NzbDrone.Core/Movies/MovieService.cs
+++ b/src/NzbDrone.Core/Movies/MovieService.cs
@@ -125,31 +125,32 @@ public Movie FindByTitle(string title, int year)
 
         public Movie FindByTitle(List<string> titles, int? year, List<string> otherTitles, List<Movie> candidates)
         {
-            var cleanTitles = titles.Select(t => t.CleanMovieTitle().ToLowerInvariant());
+            var cleanTitlesSet = new HashSet<string>(titles.Select(t => t.CleanMovieTitle().ToLowerInvariant()));
+            var otherTitlesSet = new HashSet<string>(otherTitles);
 
-            var result = candidates.Where(x => cleanTitles.Contains(x.MovieMetadata.Value.CleanTitle) || cleanTitles.Contains(x.MovieMetadata.Value.CleanOriginalTitle))
+            var result = candidates.Where(x => cleanTitlesSet.Contains(x.MovieMetadata.Value.CleanTitle) || cleanTitlesSet.Contains(x.MovieMetadata.Value.CleanOriginalTitle))
                 .AllWithYear(year)
                 .ToList();
 
             if (result == null || result.Count == 0)
             {
                 result =
-                    candidates.Where(movie => otherTitles.Contains(movie.MovieMetadata.Value.CleanTitle)).AllWithYear(year).ToList();
+                    candidates.Where(movie => otherTitlesSet.Contains(movie.MovieMetadata.Value.CleanTitle)).AllWithYear(year).ToList();
             }
 
             if (result == null || result.Count == 0)
             {
                 result = candidates
-                    .Where(m => m.MovieMetadata.Value.AlternativeTitles.Any(t => cleanTitles.Contains(t.CleanTitle) ||
-                                                        otherTitles.Contains(t.CleanTitle)))
+                    .Where(m => m.MovieMetadata.Value.AlternativeTitles.Any(t => cleanTitlesSet.Contains(t.CleanTitle) ||
+                                                        otherTitlesSet.Contains(t.CleanTitle)))
                     .AllWithYear(year).ToList();
             }
 
             if (result == null || result.Count == 0)
             {
                 result = candidates
-                    .Where(m => m.MovieMetadata.Value.Translations.Any(t => cleanTitles.Contains(t.CleanTitle) ||
-                                                        otherTitles.Contains(t.CleanTitle)))
+                    .Where(m => m.MovieMetadata.Value.Translations.Any(t => cleanTitlesSet.Contains(t.CleanTitle) ||
+                                                        otherTitlesSet.Contains(t.CleanTitle)))
                     .AllWithYear(year).ToList();
             }