SharkX is an advanced official eMule mod (ed2k open source client based on official eMule - currently 0.50a) which offers additional features to advanced ed2k users. SharkX is translated to IT (i.e. English & Italian bundled with distribution). SharkX audience are ed2k users who wishes to share and not just download (download rate is limited if downloaded > 2.5*uploaded). SharkX offers high upload bandwidth utilization (with slot focus or desired balanced number of upload slots). It offers the most advanced chunks (parts) spread mechanism (Share Only The Need to clients without Intelligent Chunk Selection) as well as leechers detection and treatment mechanism (Client Analyzer). For downloading it offers advanced sources handling (AutoHL), Faster end game (Intelligent Chunk Selection and Anti HideOS). Function which are rarely used (Web Server, IRC, peer cache) were removed for reducing CPU and Memory usage (as well as lowered CPU usage while hashing complete files).