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look even if u have a 4meg line, ur adsl is not guaranteed. this means that there will be times when the synching will not be stable between ur adsl line at ur house and the exchange and when that happens they drop ur line speed to a much more stable speed eg: 512. maybe u just stay too far away from the exchange and 512 is the most stable speed u can get and therefore they put u on that speed.
stefano international speedtests don't multithread hence why you may find the speedtests show as they do. try the iburst speedtest and see what speed that gives you