Why is Ubuntu Slow and Unable to Multi Task

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http://askubuntu.com – I am very disappointed with Ubuntu 12.04 LTS. I have tried it on two Desktops, both Pentium D 3.0ghz, one 2GB Ram, other 1.5GB Ram. In both cases 12.04 LTS was Slow, Unresponsive, and Totally Unable to Multi task. Simple tasks like Moving a File from a USB Pen take 100% of resources. More than three tabs in Chromium Browser = Desktop Seizure. I have also tried Ubuntu 11.10 on two lower spec laptops, one a Pentium 4, the other Core 2 duo, both 1GB Ram,had similar experiences to above. Ubuntu is not for me or friends that have tried it, we have found Ubuntu to be fairly User friendly, but a (HowTos)