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Random thought: it could be something weird like an MTU path problem. That's where your end is sending (say) 1500 byte packets, but some intermediate link can only support (say) a maximum of 1488. There are protocols to automatically determine the maximum common MTU, but they're often rendered useless by aggressive firewalling. MTU path discovery issues can be tricky to diagnose because often the initial setup of a protocol (such as the TCP handshake) will succeed, but then everything just stalls once it starts streaming full sized packets.
Then again, if the transfer is succeeding eventually, it's probably not that...
Are you absolutely sure that your IP - the one you're connecting from - resolves on the destination FTP server?
Examples: (do this on the server)
$ host 8.8.8.8
8.8.8.8.in-addr.arpa domain name pointer google-public-dns-a.google.com.
$ host 1.2.3.4
Host 4.3.2.1.in-addr.arpa. not found: 3(NXDOMAIN)
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