Why can't I run Safari and Skype at the same time without making my computer freeze up?

I can't believe I can't run Safari and Skype at the same time without my computer freezing up, it's a MacBook Pro with Mac OS 10.6.8 and it has an Intel Core 2 Duo CPU with 2.2 Ghz and 2 Gb of RAM. Is this a hardware problem or a software problem?

I haven't gone to the trouble of actually testing to see which uses more CPU power, but Firefox has been faster than Safari on every Mac I've ever owned.
To see CPU usage by process, open the terminal (in Utilities) and enter 'top' at the command line. You might have to expand the window as processes don't appear in any logical order.
It could also be hardware-related: I have late 2009 mini with similar specs and it pinwheels easily.

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