ﾈｯﾄ通信に詳しい人いる？(;´Д`)
http://www.speedguide.net/analyzer.php
ここで、MSSは緑色で表示されるんだけどMTUが何か言われてるみたいなんだけど
MTU = 1454
MTU sometimes used in PPPoA applications. 
If not, consider increasing your MTU to 1500 for better throughput.
If you are using a router, it could be limiting your MTU regardless of Registry settings.
 
MSS = 1414
Maximum useful data in each packet = 1414, which equals MSS. 

これ変えろってことなの？(;´Д`)