Ubuntu karmic is dead slow and hangin ,stucking ,fadin into grey while transfer

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http://www.linuxquestions.org – Hello I came to know about this bug or something in Ubuntu only in karmic version which slows down file transfer . I've used ubuntu from version 8.10 and having considerable speeds like 3-4Mbps sometimes 2.5 to 2. Even though very less its seems okay for me transfering a big 5G file or a movie to external Hdd without stucking and allowing me to do other work. Now in karmic the transfer rate is of no change but its stucks ,fades into grey and hangs . It's not allowing me to do any other work like browsing and it stucks in mouse cliks and movements. I never noticed this kind of behavior in Jaunty ,Intrepid even though transfer rate is less. It really took me more than 30 min to transfer 4.5GB iso image to external WD 40GB HDD . Its so odd and frustrating . Many people to whom i've introduced Linux and Ubuntu specially were complaining and some already went back to vista and xp. >> Is there any "work around" for this frustrating problem.. My system is upto-date config:> AMD Atlon 64 ,512MB (448mb+ 64 for graphics on board) please help >>If there is no current solution for this Please help me find a similar distro like "parsix " or something like that. Thanks In Advance (HowTos)