MacBook White lagging and hanging when certain applications are being run

My 9-month-old MacBook White (Core 2 Duo, 2.4 GHz) lags whenever I use SketchUp, and hangs sometimes when I use FlightGear or X-Plane (flight simulators). No other applications were running when these were being used. Is it a CPU problem, or a RAM shortage? Any answers and/or clarification would be much appreciated.

Can you go to Applications > Utilities > Activity Monitor and check that all the processes you are running are Intel (you will find this info under the "Kind" column in the Activity Monitor window).
Also see (in the same window, under the "%CPU" column) if there appears to be any processes which are using an inordinate amount of CPU.

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