WeB100 Report Throttled again and again

[pupa]

Web100 reports the Round trip time = 548.69 msec; the Packet size = 1452 Bytes; and
There were 11 packets retransmitted, 12 duplicate acks received, and 17 SACK blocks received
The connection stalled 2 times due to packet loss
The connection was idle 1.94 seconds (11.41%) of the time
This connection is network limited 99.92% of the time.
Excessive packet loss is impacting your performance, check the auto-negotiate function on your local PC and network switch

What more can we say?
Look at this TCPIQ graph for today. Everytime I use a Optimising program to set TCP variables or play with MTU and window TCP window I get maximum transfer peaks on test and then it reduced back to crawl speed ??????????????????????????
http://www.tcpiq.com/tcpIQ/LineSpee...ountryId=196&ConnectionId=14895&UserId=171952