> 4243984 bytes received 
> at 2793 bytes/sec
>
> 1226058 bytes received at 2217 
> bytes/sec

> A.(excuse me my bad english)At the same conditions the 
> difference in  download velocity is drammaticaly 
> stratosferic.Why?
The amount of data is 4 times more important in the first 
run. Did you update the existing mirror ? Or maybe the 3.31 
release captured more data ?