Thank you for your post, the data rate for sending the file is indeed very good the other data rate, (1.2MBps) would be almost consistent with the data transfer speeds of a 56Mbps connection. I know you stated that on the Vaio* you have a 802.11n card, if the other computer has a 802.11a/b/g card then it would explain the speeds. Otherwise you might want to look for other causes for the slow speed, check if there are any automatic downloads going on, try testing with the firewall and anti-virus disabled. Make sure that on both systems you have a good signal (non fluctuating) check in task manager if any process is taking up the CPU.
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