Increase ReadStream bufferSize to 64k

lib/fs.js

@@ -6,7 +6,7 @@ var binding = process.binding('fs');
 var fs = exports;
 
 var kMinPoolSpace = 128;
-var kPoolSize = 40*1024;
+var kPoolSize = 40 * 1024;
 
 fs.Stats = binding.Stats;
 
@@ -618,7 +618,7 @@ var ReadStream = fs.ReadStream = function(path, options) {
 
   this.flags = 'r';
   this.mode = 0666;
-  this.bufferSize = 4 * 1024;
+  this.bufferSize = 64 * 1024;
 
   options = options || {};