Seems your ISP is slowing Gnutella packets Try an alternative P2P like Ares to see if it happens on another P2P protocol than Gnutella http://aresgalaxy.org/

Bonne chance

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Liens d'intérêt /Links of interest:
Gnutellaforums en français /The House's rules you have to respect / First search the forum, then create a thread / Free software alternatives! - Logiciels alternatifs gratuits!/