diff --git a/src/NzbDrone.Common/Extensions/StreamExtensions.cs b/src/NzbDrone.Common/Extensions/StreamExtensions.cs
index 8f6036baa..b4ab5ad8e 100644
--- a/src/NzbDrone.Common/Extensions/StreamExtensions.cs
+++ b/src/NzbDrone.Common/Extensions/StreamExtensions.cs
@@ -1,18 +1,19 @@
 using System.IO;
+using System.Threading.Tasks;
 
 namespace NzbDrone.Common.Extensions
 {
     public static class StreamExtensions
     {
-        public static byte[] ToBytes(this Stream input)
+        public static async Task<byte[]> ToBytes(this Stream input)
         {
             var buffer = new byte[16 * 1024];
             using (var ms = new MemoryStream())
             {
                 int read;
-                while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
+                while ((read = await input.ReadAsync(buffer, 0, buffer.Length)) > 0)
                 {
-                    ms.Write(buffer, 0, read);
+                    await ms.WriteAsync(buffer, 0, read);
                 }
 
                 return ms.ToArray();
diff --git a/src/NzbDrone.Common/Http/Dispatchers/IHttpDispatcher.cs b/src/NzbDrone.Common/Http/Dispatchers/IHttpDispatcher.cs
index 8e665ceed..a5565f26b 100644
--- a/src/NzbDrone.Common/Http/Dispatchers/IHttpDispatcher.cs
+++ b/src/NzbDrone.Common/Http/Dispatchers/IHttpDispatcher.cs
@@ -1,9 +1,10 @@
 using System.Net;
+using System.Threading.Tasks;
 
 namespace NzbDrone.Common.Http.Dispatchers
 {
     public interface IHttpDispatcher
     {
-        HttpResponse GetResponse(HttpRequest request, CookieContainer cookies);
+        Task<HttpResponse> GetResponseAsync(HttpRequest request, CookieContainer cookies);
     }
 }
diff --git a/src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs b/src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs
index 96762f120..96a4f3966 100644
--- a/src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs
+++ b/src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs
@@ -3,6 +3,7 @@
 using System.IO.Compression;
 using System.Net;
 using System.Reflection;
+using System.Threading.Tasks;
 using NLog;
 using NLog.Fluent;
 using NzbDrone.Common.EnvironmentInfo;
@@ -28,7 +29,7 @@ public ManagedHttpDispatcher(IHttpProxySettingsProvider proxySettingsProvider, I
             _logger = logger;
         }
 
-        public HttpResponse GetResponse(HttpRequest request, CookieContainer cookies)
+        public async Task<HttpResponse> GetResponseAsync(HttpRequest request, CookieContainer cookies)
         {
             var webRequest = (HttpWebRequest)WebRequest.Create((Uri)request.Url);
 
@@ -77,7 +78,7 @@ public HttpResponse GetResponse(HttpRequest request, CookieContainer cookies)
                     }
                 }
 
-                httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
+                httpWebResponse = (HttpWebResponse)await webRequest.GetResponseAsync();
             }
             catch (WebException e)
             {
@@ -120,7 +121,7 @@ public HttpResponse GetResponse(HttpRequest request, CookieContainer cookies)
                 {
                     try
                     {
-                        data = responseStream.ToBytes();
+                        data = await responseStream.ToBytes();
 
                         if (PlatformInfo.IsMono && httpWebResponse.ContentEncoding == "gzip")
                         {
diff --git a/src/NzbDrone.Common/Http/HttpClient.cs b/src/NzbDrone.Common/Http/HttpClient.cs
index cce6d125f..cd403034c 100644
--- a/src/NzbDrone.Common/Http/HttpClient.cs
+++ b/src/NzbDrone.Common/Http/HttpClient.cs
@@ -4,6 +4,7 @@
 using System.IO;
 using System.Linq;
 using System.Net;
+using System.Threading.Tasks;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.EnvironmentInfo;
@@ -24,6 +25,16 @@ HttpResponse<T> Get<T>(HttpRequest request)
         HttpResponse Post(HttpRequest request);
         HttpResponse<T> Post<T>(HttpRequest request)
             where T : new();
+
+        Task<HttpResponse> ExecuteAsync(HttpRequest request);
+        Task DownloadFileAsync(string url, string fileName);
+        Task<HttpResponse> GetAsync(HttpRequest request);
+        Task<HttpResponse<T>> GetAsync<T>(HttpRequest request)
+            where T : new();
+        Task<HttpResponse> HeadAsync(HttpRequest request);
+        Task<HttpResponse> PostAsync(HttpRequest request);
+        Task<HttpResponse<T>> PostAsync<T>(HttpRequest request)
+            where T : new();
     }
 
     public class HttpClient : IHttpClient
@@ -54,11 +65,11 @@ public HttpClient(IEnumerable<IHttpRequestInterceptor> requestInterceptors,
             _cookieContainerCache = cacheManager.GetCache<CookieContainer>(typeof(HttpClient));
         }
 
-        public HttpResponse Execute(HttpRequest request)
+        public async Task<HttpResponse> ExecuteAsync(HttpRequest request)
         {
             var cookieContainer = InitializeRequestCookies(request);
 
-            var response = ExecuteRequest(request, cookieContainer);
+            var response = await ExecuteRequestAsync(request, cookieContainer);
 
             if (request.AllowAutoRedirect && response.HasHttpRedirect)
             {
@@ -77,7 +88,7 @@ public HttpResponse Execute(HttpRequest request)
                         throw new WebException($"Too many automatic redirections were attempted for {autoRedirectChain.Join(" -> ")}", WebExceptionStatus.ProtocolError);
                     }
 
-                    response = ExecuteRequest(request, cookieContainer);
+                    response = await ExecuteRequestAsync(request, cookieContainer);
                 }
                 while (response.HasHttpRedirect);
             }
@@ -104,7 +115,12 @@ public HttpResponse Execute(HttpRequest request)
             return response;
         }
 
-        private HttpResponse ExecuteRequest(HttpRequest request, CookieContainer cookieContainer)
+        public HttpResponse Execute(HttpRequest request)
+        {
+            return ExecuteAsync(request).GetAwaiter().GetResult();
+        }
+
+        private async Task<HttpResponse> ExecuteRequestAsync(HttpRequest request, CookieContainer cookieContainer)
         {
             foreach (var interceptor in _requestInterceptors)
             {
@@ -113,7 +129,7 @@ private HttpResponse ExecuteRequest(HttpRequest request, CookieContainer cookieC
 
             if (request.RateLimit != TimeSpan.Zero)
             {
-                _rateLimitService.WaitAndPulse(request.Url.Host, request.RateLimit);
+                await _rateLimitService.WaitAndPulseAsync(request.Url.Host, request.RateLimit);
             }
 
             _logger.Trace(request);
@@ -122,7 +138,7 @@ private HttpResponse ExecuteRequest(HttpRequest request, CookieContainer cookieC
 
             PrepareRequestCookies(request, cookieContainer);
 
-            var response = _httpDispatcher.GetResponse(request, cookieContainer);
+            var response = await _httpDispatcher.GetResponseAsync(request, cookieContainer);
 
             HandleResponseCookies(response, cookieContainer);
 
@@ -231,7 +247,7 @@ private void HandleResponseCookies(HttpResponse response, CookieContainer cookie
             }
         }
 
-        public void DownloadFile(string url, string fileName)
+        public async Task DownloadFileAsync(string url, string fileName)
         {
             try
             {
@@ -247,7 +263,7 @@ public void DownloadFile(string url, string fileName)
                 using (var webClient = new GZipWebClient())
                 {
                     webClient.Headers.Add(HttpRequestHeader.UserAgent, _userAgentBuilder.GetUserAgent());
-                    webClient.DownloadFile(url, fileName);
+                    await webClient.DownloadFileTaskAsync(url, fileName);
                     stopWatch.Stop();
                     _logger.Debug("Downloading Completed. took {0:0}s", stopWatch.Elapsed.Seconds);
                 }
@@ -255,47 +271,92 @@ public void DownloadFile(string url, string fileName)
             catch (WebException e)
             {
                 _logger.Warn("Failed to get response from: {0} {1}", url, e.Message);
+
+                if (File.Exists(fileName))
+                {
+                    File.Delete(fileName);
+                }
+
                 throw;
             }
             catch (Exception e)
             {
                 _logger.Warn(e, "Failed to get response from: " + url);
+
+                if (File.Exists(fileName))
+                {
+                    File.Delete(fileName);
+                }
+
                 throw;
             }
         }
 
-        public HttpResponse Get(HttpRequest request)
+        public void DownloadFile(string url, string fileName)
+        {
+            // https://docs.microsoft.com/en-us/archive/msdn-magazine/2015/july/async-programming-brownfield-async-development#the-thread-pool-hack
+            Task.Run(() => DownloadFileAsync(url, fileName)).GetAwaiter().GetResult();
+        }
+
+        public Task<HttpResponse> GetAsync(HttpRequest request)
         {
             request.Method = HttpMethod.GET;
-            return Execute(request);
+            return ExecuteAsync(request);
+        }
+
+        public HttpResponse Get(HttpRequest request)
+        {
+            return Task.Run(() => GetAsync(request)).GetAwaiter().GetResult();
+        }
+
+        public async Task<HttpResponse<T>> GetAsync<T>(HttpRequest request)
+            where T : new()
+        {
+            var response = await GetAsync(request);
+            CheckResponseContentType(response);
+            return new HttpResponse<T>(response);
         }
 
         public HttpResponse<T> Get<T>(HttpRequest request)
             where T : new()
         {
-            var response = Get(request);
-            CheckResponseContentType(response);
-            return new HttpResponse<T>(response);
+            return Task.Run(() => GetAsync<T>(request)).GetAwaiter().GetResult();
+        }
+
+        public Task<HttpResponse> HeadAsync(HttpRequest request)
+        {
+            request.Method = HttpMethod.HEAD;
+            return ExecuteAsync(request);
         }
 
         public HttpResponse Head(HttpRequest request)
         {
-            request.Method = HttpMethod.HEAD;
-            return Execute(request);
+            return Task.Run(() => HeadAsync(request)).GetAwaiter().GetResult();
+        }
+
+        public Task<HttpResponse> PostAsync(HttpRequest request)
+        {
+            request.Method = HttpMethod.POST;
+            return ExecuteAsync(request);
         }
 
         public HttpResponse Post(HttpRequest request)
         {
-            request.Method = HttpMethod.POST;
-            return Execute(request);
+            return Task.Run(() => PostAsync(request)).GetAwaiter().GetResult();
+        }
+
+        public async Task<HttpResponse<T>> PostAsync<T>(HttpRequest request)
+            where T : new()
+        {
+            var response = await PostAsync(request);
+            CheckResponseContentType(response);
+            return new HttpResponse<T>(response);
         }
 
         public HttpResponse<T> Post<T>(HttpRequest request)
             where T : new()
         {
-            var response = Post(request);
-            CheckResponseContentType(response);
-            return new HttpResponse<T>(response);
+            return Task.Run(() => PostAsync<T>(request)).GetAwaiter().GetResult();
         }
 
         private void CheckResponseContentType(HttpResponse response)
diff --git a/src/NzbDrone.Common/TPL/RateLimitService.cs b/src/NzbDrone.Common/TPL/RateLimitService.cs
index f0d30b4ff..af3bdc7b9 100644
--- a/src/NzbDrone.Common/TPL/RateLimitService.cs
+++ b/src/NzbDrone.Common/TPL/RateLimitService.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Concurrent;
+using System.Threading.Tasks;
 using NLog;
 using NzbDrone.Common.Cache;
 
@@ -8,6 +9,7 @@ namespace NzbDrone.Common.TPL
     public interface IRateLimitService
     {
         void WaitAndPulse(string key, TimeSpan interval);
+        Task WaitAndPulseAsync(string key, TimeSpan interval);
     }
 
     public class RateLimitService : IRateLimitService
@@ -23,13 +25,7 @@ public RateLimitService(ICacheManager cacheManager, Logger logger)
 
         public void WaitAndPulse(string key, TimeSpan interval)
         {
-            var waitUntil = _rateLimitStore.AddOrUpdate(key,
-                (s) => DateTime.UtcNow + interval,
-                (s, i) => new DateTime(Math.Max(DateTime.UtcNow.Ticks, i.Ticks), DateTimeKind.Utc) + interval);
-
-            waitUntil -= interval;
-
-            var delay = waitUntil - DateTime.UtcNow;
+            var delay = GetDelay(key, interval);
 
             if (delay.TotalSeconds > 0.0)
             {
@@ -37,5 +33,27 @@ public void WaitAndPulse(string key, TimeSpan interval)
                 System.Threading.Thread.Sleep(delay);
             }
         }
+
+        public async Task WaitAndPulseAsync(string key, TimeSpan interval)
+        {
+            var delay = GetDelay(key, interval);
+
+            if (delay.TotalSeconds > 0.0)
+            {
+                _logger.Trace("Rate Limit triggered, delaying '{0}' for {1:0.000} sec", key, delay.TotalSeconds);
+                await Task.Delay(delay);
+            }
+        }
+
+        private TimeSpan GetDelay(string key, TimeSpan interval)
+        {
+            var waitUntil = _rateLimitStore.AddOrUpdate(key,
+                (s) => DateTime.UtcNow + interval,
+                (s, i) => new DateTime(Math.Max(DateTime.UtcNow.Ticks, i.Ticks), DateTimeKind.Utc) + interval);
+
+            waitUntil -= interval;
+
+            return waitUntil - DateTime.UtcNow;
+        }
     }
 }
diff --git a/src/NzbDrone.Core/MetadataSource/IProvideMovieInfo.cs b/src/NzbDrone.Core/MetadataSource/IProvideMovieInfo.cs
index 25c109a34..fb59db871 100644
--- a/src/NzbDrone.Core/MetadataSource/IProvideMovieInfo.cs
+++ b/src/NzbDrone.Core/MetadataSource/IProvideMovieInfo.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 using NzbDrone.Core.Movies;
 using NzbDrone.Core.Movies.Credits;
 
@@ -10,5 +11,7 @@ public interface IProvideMovieInfo
         Movie GetMovieByImdbId(string imdbId);
         Tuple<Movie, List<Credit>> GetMovieInfo(int tmdbId);
         HashSet<int> GetChangedMovies(DateTime startTime);
+
+        Task<Tuple<Movie, List<Credit>>> GetMovieInfoAsync(int tmdbId);
     }
 }
diff --git a/src/NzbDrone.Core/MetadataSource/ISearchForNewMovie.cs b/src/NzbDrone.Core/MetadataSource/ISearchForNewMovie.cs
index 637bdaae4..a5a9c1f06 100644
--- a/src/NzbDrone.Core/MetadataSource/ISearchForNewMovie.cs
+++ b/src/NzbDrone.Core/MetadataSource/ISearchForNewMovie.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Threading.Tasks;
 using NzbDrone.Core.Movies;
 
 namespace NzbDrone.Core.MetadataSource
@@ -8,5 +9,6 @@ public interface ISearchForNewMovie
         List<Movie> SearchForNewMovie(string title);
 
         Movie MapMovieToTmdbMovie(Movie movie);
+        Task<Movie> MapMovieToTmdbMovieAsync(Movie movie);
     }
 }
diff --git a/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs b/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs
index a0d838325..57c56d4b8 100644
--- a/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs
+++ b/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Threading.Tasks;
 using NLog;
 using NzbDrone.Common.Cloud;
 using NzbDrone.Common.Extensions;
@@ -14,7 +15,6 @@
 using NzbDrone.Core.Movies;
 using NzbDrone.Core.Movies.AlternativeTitles;
 using NzbDrone.Core.Movies.Credits;
-using NzbDrone.Core.NetImport.ImportExclusions;
 using NzbDrone.Core.NetImport.TMDb;
 using NzbDrone.Core.Parser;
 
@@ -65,7 +65,7 @@ public HashSet<int> GetChangedMovies(DateTime startTime)
             return new HashSet<int>(response.Resource.Results.Select(c => c.id));
         }
 
-        public Tuple<Movie, List<Credit>> GetMovieInfo(int tmdbId)
+        public async Task<Tuple<Movie, List<Credit>>> GetMovieInfoAsync(int tmdbId)
         {
             var httpRequest = _radarrMetadata.Create()
                                              .SetSegment("route", "movie")
@@ -75,7 +75,7 @@ public Tuple<Movie, List<Credit>> GetMovieInfo(int tmdbId)
             httpRequest.AllowAutoRedirect = true;
             httpRequest.SuppressHttpError = true;
 
-            var httpResponse = _httpClient.Get<MovieResource>(httpRequest);
+            var httpResponse = await _httpClient.GetAsync<MovieResource>(httpRequest);
 
             if (httpResponse.HasHttpError)
             {
@@ -98,6 +98,11 @@ public Tuple<Movie, List<Credit>> GetMovieInfo(int tmdbId)
             return new Tuple<Movie, List<Credit>>(movie, credits.ToList());
         }
 
+        public Tuple<Movie, List<Credit>> GetMovieInfo(int tmdbId)
+        {
+            return GetMovieInfoAsync(tmdbId).GetAwaiter().GetResult();
+        }
+
         public Movie GetMovieByImdbId(string imdbId)
         {
             var httpRequest = _radarrMetadata.Create()
@@ -236,14 +241,14 @@ private string StripTrailingTheFromTitle(string title)
             return title;
         }
 
-        public Movie MapMovieToTmdbMovie(Movie movie)
+        public async Task<Movie> MapMovieToTmdbMovieAsync(Movie movie)
         {
             try
             {
                 Movie newMovie = movie;
                 if (movie.TmdbId > 0)
                 {
-                    newMovie = GetMovieInfo(movie.TmdbId).Item1;
+                    newMovie = (await GetMovieInfoAsync(movie.TmdbId)).Item1;
                 }
                 else if (movie.ImdbId.IsNotNullOrWhiteSpace())
                 {
@@ -283,6 +288,11 @@ public Movie MapMovieToTmdbMovie(Movie movie)
             }
         }
 
+        public Movie MapMovieToTmdbMovie(Movie movie)
+        {
+            return MapMovieToTmdbMovieAsync(movie).GetAwaiter().GetResult();
+        }
+
         public List<Movie> SearchForNewMovie(string title)
         {
             try
diff --git a/src/NzbDrone.Core/NetImport/TMDb/TMDbImportBase.cs b/src/NzbDrone.Core/NetImport/TMDb/TMDbImportBase.cs
index 36875a403..996655695 100644
--- a/src/NzbDrone.Core/NetImport/TMDb/TMDbImportBase.cs
+++ b/src/NzbDrone.Core/NetImport/TMDb/TMDbImportBase.cs
@@ -1,4 +1,5 @@
-using NLog;
+using System;
+using NLog;
 using NzbDrone.Common.Cloud;
 using NzbDrone.Common.Http;
 using NzbDrone.Core.Configuration;
@@ -11,6 +12,7 @@ public abstract class TMDbNetImportBase<TSettings> : HttpNetImportBase<TSettings
         where TSettings : TMDbSettingsBase<TSettings>, new()
     {
         public override NetImportType ListType => NetImportType.TMDB;
+        public override TimeSpan RateLimit => TimeSpan.Zero;
 
         public readonly ISearchForNewMovie _skyhookProxy;
         public readonly IHttpRequestBuilderFactory _requestBuilder;
diff --git a/src/Radarr.Api.V3/Movies/FetchMovieListModule.cs b/src/Radarr.Api.V3/Movies/FetchMovieListModule.cs
index 243556dd3..15e7d5630 100644
--- a/src/Radarr.Api.V3/Movies/FetchMovieListModule.cs
+++ b/src/Radarr.Api.V3/Movies/FetchMovieListModule.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
 using Nancy;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Core.MediaCover;
@@ -27,22 +28,14 @@ private object Search()
         {
             var results = _fetchNetImport.FetchAndFilter((int)Request.Query.listId, false);
 
-            List<Movie> realResults = new List<Movie>();
+            var tasks = results.Where(movie => movie.TmdbId == 0 || !movie.Images.Any() || movie.Overview.IsNullOrWhiteSpace())
+                .Select(x => _movieSearch.MapMovieToTmdbMovieAsync(x));
 
-            foreach (var movie in results)
-            {
-                var mapped = movie;
+            var realResults = results.Where(movie => movie.TmdbId != 0 && movie.Images.Any() && movie.Overview.IsNotNullOrWhiteSpace()).ToList();
 
-                if (movie.TmdbId == 0 || !movie.Images.Any() || movie.Overview.IsNullOrWhiteSpace())
-                {
-                    mapped = _movieSearch.MapMovieToTmdbMovie(movie);
-                }
+            var mapped = Task.WhenAll(tasks).GetAwaiter().GetResult();
 
-                if (mapped != null)
-                {
-                    realResults.Add(mapped);
-                }
-            }
+            realResults.AddRange(mapped.Where(x => x != null));
 
             return MapToResource(realResults);
         }