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It is due to some compatibility issues between windows7 and XP. In this case it could be due to “Remote Differential Compression” .
Remote Differential Compression (RDC) allows applications to synchronize data between two computers in an efficient manner. By measuring differences between network files using the RDC compression algorithm files can be synchronized using minimal bandwidth by limiting the amount of data that needs to be sent across the network.
Because many pre-Vista Windows operating systems don’t use RDC it may hamper network performance. By turning RDC off may increase copying efficiency.
To fix slow sending or receiving of files through lan network try to disbale the following :
large send offload v2 (IPv4)-Disable
large send offload v2 (IPv6)-Disable
