Added BufferedStream for reading from DeflateStream - reduces loading… (

#5924)

Co-authored-by: Martin Tomášek <tomasek@emclient.com>

src/Microsoft.ML.Data/DataLoadSave/Binary/BinaryLoader.cs

@@ -617,7 +617,8 @@ protected void EnsureValue()
                             stream.Seek(BlockOffset, SeekOrigin.Begin);
                             using (var subset = new SubsetStream(stream, BlockSize))
                             using (var decompressed = Compression.DecompressStream(subset))
-                            using (var valueReader = _codec.OpenReader(decompressed, 1))
+                            using (var bufferedStream = new BufferedStream(decompressed))
+                            using (var valueReader = _codec.OpenReader(bufferedStream, 1))
                             {
                                 valueReader.MoveNext();
                                 valueReader.Get(ref Value);