Your 20 Mega bit (Mb) connection, will max out at around 2.4 Mega Bytes (MB).
So if your connection is running at 2.5MB per second, then that is ok, but if it is running at 2.5Mb per second then it is not.
a handy article from speedguide.net explaining the difference
http://www.speedguide.net/read_articles.php?id=115