diff --git a/Emby.Server.Implementations/ApplicationHost.cs b/Emby.Server.Implementations/ApplicationHost.cs
index 18b6834ef5..531775302b 100644
--- a/Emby.Server.Implementations/ApplicationHost.cs
+++ b/Emby.Server.Implementations/ApplicationHost.cs
@@ -43,9 +43,9 @@ using Emby.Server.Implementations.Security;
 using Emby.Server.Implementations.Serialization;
 using Emby.Server.Implementations.Services;
 using Emby.Server.Implementations.Session;
+using Emby.Server.Implementations.SyncPlay;
 using Emby.Server.Implementations.TV;
 using Emby.Server.Implementations.Updates;
-using Emby.Server.Implementations.SyncPlay;
 using MediaBrowser.Api;
 using MediaBrowser.Common;
 using MediaBrowser.Common.Configuration;
@@ -78,8 +78,8 @@ using MediaBrowser.Controller.Security;
 using MediaBrowser.Controller.Session;
 using MediaBrowser.Controller.Sorting;
 using MediaBrowser.Controller.Subtitles;
-using MediaBrowser.Controller.TV;
 using MediaBrowser.Controller.SyncPlay;
+using MediaBrowser.Controller.TV;
 using MediaBrowser.LocalMetadata.Savers;
 using MediaBrowser.MediaEncoding.BdInfo;
 using MediaBrowser.Model.Configuration;
@@ -484,12 +484,10 @@ namespace Emby.Server.Implementations
 
                 foreach (var plugin in Plugins)
                 {
-                    pluginBuilder.AppendLine(
-                        string.Format(
-                            CultureInfo.InvariantCulture,
-                            "{0} {1}",
-                            plugin.Name,
-                            plugin.Version));
+                    pluginBuilder.Append(plugin.Name)
+                        .Append(' ')
+                        .Append(plugin.Version)
+                        .AppendLine();
                 }
 
                 Logger.LogInformation("Plugins: {Plugins}", pluginBuilder.ToString());
@@ -1153,7 +1151,7 @@ namespace Emby.Server.Implementations
                     return null;
                 }
 
-                return GetLocalApiUrl(addresses.First());
+                return GetLocalApiUrl(addresses[0]);
             }
             catch (Exception ex)
             {
@@ -1226,7 +1224,7 @@ namespace Emby.Server.Implementations
             var addresses = ServerConfigurationManager
                 .Configuration
                 .LocalNetworkAddresses
-                .Select(NormalizeConfiguredLocalAddress)
+                .Select(x => NormalizeConfiguredLocalAddress(x))
                 .Where(i => i != null)
                 .ToList();
 
@@ -1247,8 +1245,7 @@ namespace Emby.Server.Implementations
                     }
                 }
 
-                var valid = await IsLocalIpAddressValidAsync(address, cancellationToken).ConfigureAwait(false);
-                if (valid)
+                if (await IsLocalIpAddressValidAsync(address, cancellationToken).ConfigureAwait(false))
                 {
                     resultList.Add(address);
 
@@ -1262,13 +1259,12 @@ namespace Emby.Server.Implementations
             return resultList;
         }
 
-        public IPAddress NormalizeConfiguredLocalAddress(string address)
+        public IPAddress NormalizeConfiguredLocalAddress(ReadOnlySpan<char> address)
         {
             var index = address.Trim('/').IndexOf('/');
-
             if (index != -1)
             {
-                address = address.Substring(index + 1);
+                address = address.Slice(index + 1);
             }
 
             if (IPAddress.TryParse(address.Trim('/'), out IPAddress result))
diff --git a/Jellyfin.Server/Program.cs b/Jellyfin.Server/Program.cs
index 4d898ff5e3..ef3ebe90cb 100644
--- a/Jellyfin.Server/Program.cs
+++ b/Jellyfin.Server/Program.cs
@@ -274,10 +274,10 @@ namespace Jellyfin.Server
                     var addresses = appHost.ServerConfigurationManager
                         .Configuration
                         .LocalNetworkAddresses
-                        .Select(appHost.NormalizeConfiguredLocalAddress)
+                        .Select(x => appHost.NormalizeConfiguredLocalAddress(x))
                         .Where(i => i != null)
                         .ToHashSet();
-                    if (addresses.Any() && !addresses.Contains(IPAddress.Any))
+                    if (addresses.Count > 0 && !addresses.Contains(IPAddress.Any))
                     {
                         if (!addresses.Contains(IPAddress.Loopback))
                         {
diff --git a/MediaBrowser.Model/Dlna/StreamInfo.cs b/MediaBrowser.Model/Dlna/StreamInfo.cs
index 8d7554e881..204340c466 100644
--- a/MediaBrowser.Model/Dlna/StreamInfo.cs
+++ b/MediaBrowser.Model/Dlna/StreamInfo.cs
@@ -144,7 +144,7 @@ namespace MediaBrowser.Model.Dlna
 
         public Dictionary<string, string> StreamOptions { get; private set; }
 
-        public string MediaSourceId => MediaSource == null ? null : MediaSource.Id;
+        public string MediaSourceId => MediaSource?.Id;
 
         public bool IsDirectStream =>
             PlayMethod == PlayMethod.DirectStream ||
diff --git a/MediaBrowser.Providers/Plugins/Tmdb/Movies/TmdbMovieProvider.cs b/MediaBrowser.Providers/Plugins/Tmdb/Movies/TmdbMovieProvider.cs
index 5e2b83294a..74870c9992 100644
--- a/MediaBrowser.Providers/Plugins/Tmdb/Movies/TmdbMovieProvider.cs
+++ b/MediaBrowser.Providers/Plugins/Tmdb/Movies/TmdbMovieProvider.cs
@@ -148,7 +148,7 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.Movies
 
             using (HttpResponseInfo response = await GetMovieDbResponse(new HttpRequestOptions
             {
-                Url = string.Format(TmdbConfigUrl, TmdbUtils.ApiKey),
+                Url = string.Format(CultureInfo.InvariantCulture, TmdbConfigUrl, TmdbUtils.ApiKey),
                 CancellationToken = cancellationToken,
                 AcceptHeader = TmdbUtils.AcceptHeader
             }).ConfigureAwait(false))
@@ -245,7 +245,7 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.Movies
                 preferredLanguage = "alllang";
             }
 
-            var filename = string.Format("all-{0}.json", preferredLanguage);
+            var filename = string.Format(CultureInfo.InvariantCulture, "all-{0}.json", preferredLanguage);
 
             return Path.Combine(path, filename);
         }
@@ -276,7 +276,7 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.Movies
                 languages.Add("en");
             }
 
-            return string.Join(",", languages.ToArray());
+            return string.Join(",", languages);
         }
 
         public static string NormalizeLanguage(string language)
@@ -321,11 +321,11 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.Movies
         /// <returns>Task{CompleteMovieData}.</returns>
         internal async Task<MovieResult> FetchMainResult(string id, bool isTmdbId, string language, CancellationToken cancellationToken)
         {
-            var url = string.Format(GetMovieInfo3, id, TmdbUtils.ApiKey);
+            var url = string.Format(CultureInfo.InvariantCulture, GetMovieInfo3, id, TmdbUtils.ApiKey);
 
             if (!string.IsNullOrEmpty(language))
             {
-                url += string.Format("&language={0}", NormalizeLanguage(language));
+                url += string.Format(CultureInfo.InvariantCulture, "&language={0}", NormalizeLanguage(language));
 
                 // Get images in english and with no language
                 url += "&include_image_language=" + GetImageLanguagesParam(language);
@@ -377,7 +377,7 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.Movies
             {
                 _logger.LogInformation("MovieDbProvider couldn't find meta for language " + language + ". Trying English...");
 
-                url = string.Format(GetMovieInfo3, id, TmdbUtils.ApiKey) + "&language=en";
+                url = string.Format(CultureInfo.InvariantCulture, GetMovieInfo3, id, TmdbUtils.ApiKey) + "&language=en";
 
                 if (!string.IsNullOrEmpty(language))
                 {