diff --git a/lib/create-options.js b/lib/create-options.js
index 271564d..0b4dd16 100644
--- a/lib/create-options.js
+++ b/lib/create-options.js
@@ -21,8 +21,8 @@ module.exports = function (opts, server){
 	}
 	
 	//Default window size 4: https://github.com/joyent/node/issues/6696
-	var windowSize = sanitizeNumber (opts.windowSize || 4);
-	if (windowSize > 65535) windowSize = 4;
+	var windowSize = sanitizeNumber (opts.windowSize || 1);
+	if (windowSize > 65535) windowSize = 1;
 	
 	//Maximum block size before IP packet fragmentation on Ethernet networks
 	var blockSize = sanitizeNumber (opts.blockSize || 1468);
@@ -40,17 +40,20 @@ module.exports = function (opts, server){
 		rollover: 0
 	};
 	
+
+	// disable these extension by default
 	options.extensionsString = {
-		blksize: blockSize + "",
-		timeout: timeout + "",
-		windowsize: windowSize + "",
-		rollover: "0"
+		// blksize: blockSize + "",
+		// timeout: timeout + "",
+		// windowsize: windowSize + "",
+		// rollover: "0"
 	};
-	
-	options.extensionsLength = 48 +
-			options.extensionsString.blksize.length +
-			options.extensionsString.timeout.length +
-			options.extensionsString.windowsize.length;
+
+	options.extensionsLength = "tsize".length + 2;
+	for (var k in options.extensionsString) {
+		options.extensionsLength += (k.length + extensionsString[k].length + 2);
+	};
+
 	
 	return options;
 };
\ No newline at end of file