using OLD computer - system getting very slow

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http://askubuntu.com – I am using Lenovo computer having the following configuration: 516 MB RAM and 3.06 GHz CPU When I installed 11.04, the system was getting very slow. From the Internet, I read an article that Lubuntu desktop are very light-weight desktop, so I installed it in Ubuntu. When I switched to Lubuntu desktop, the system got a little bit faster, but when I open YouTube site or some other video-streaming websites, the system gets slower. Also, there is very known problem in Linux, when system gets hanged then after waiting some time it does not get normal. In Windows, when system hanged after some tim (HowTos)