download in parallel

Program.cs

@@ -107,21 +107,21 @@ static async Task RunJob(Config config, CancellationToken token)
 static async Task RecurseDirectory(SftpClient client, string source, string destination, bool deleteDirectory, CancellationToken token)
 {
     Log.Information($"Scanning directory '{source}'");
-    await foreach (var item in client.ListDirectoryAsync(source, token))
+    await Parallel.ForEachAsync(client.ListDirectoryAsync(source, token), token, async (item,token) =>
     {
-        if (item.Name is ".." or ".") continue;
+        if (item.Name is ".." or ".") return;
 
         if (item.IsDirectory)
         {
             var newPath = Path.Combine(destination, item.Name);
             await RecurseDirectory(client, item.FullName, newPath, true, token);
-            continue;
+            return;
         }
 
         await DownloadFile(client, item, destination, token);
         Log.Information($"Deleting '{item.Name}'");
         await client.DeleteAsync(item.FullName, token);
-    }
+    });
 
     if (deleteDirectory)
     {