just for info, dont know if it works for other but it did for my friend...

my friend using Streamyx 1M and play with him lag like hell, always getting red latency bar more then 1000ms... so he call up TMNut and ask to check. They ask him to clear the cookies and temp files and now is latency not going more then 1000ms, mostly around 400ms - 500ms... so give it a try and see...