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I'm going to be honest with you, that 7 year-old computer is near the bottom of the system requirements spec. Although the minimum requirements say a 2.0GHz processor and 4GB RAM, 2.4 and 6GB isn't much of a leap. Experiencing some hiccups like that may not even be due to the software, but rather bottlenecks in accessing the data from the drive.
I'd be more curious as to what other background processes and tasks you may be able to disable or optimize in order to get the most out of the hardware you're using.