Assign a bigger buffer to bufferedreader

Author: rhpvorderman

src/isal/igzip.py

@@ -168,7 +168,7 @@ def __init__(self, filename=None, mode=None,
                                                   0)
         if self.mode == READ:
             raw = _IGzipReader(self.fileobj)
-            self._buffer = io.BufferedReader(raw)
+            self._buffer = io.BufferedReader(raw, 128 * 1024)
 
     def __repr__(self):
         s = repr(self.fileobj)