Low upload speed of transmission but high on deluge

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http://askubuntu.com – I created a torrent from Transmission in ubuntu 12.10 x64 from my laptop connected to a router via wifi. Same router is connected to a Desktop with windows xp and utorrent client. When i seeded from laptop, the upload speed was just 120 KBPS to desktop. I then installed Deluge torrent client(in laptop) which gave me around 3-4MBPS speed. But when i host a server in laptop using python -m SimpleHTTPServer and download in firefox browser in desktop, download speed is around 8-11 MBPS I want to know that how this much difference is there and why transmission gives such low speed. There were no up (HowTos)