The computer's RAM (Random Access Memory) will greatly affect it's performance. The more RAM it has the faster it can run and the more programs it can run at the same time. While it's not feasible to change the CPU on a computer to increase performance, it's usually easy and relatively inexpensive to increase the amount of RAM.

Here are the recommendations:

Level Programs and use
LOW * Simple Web browsing (Microsoft minimum) 128MB 256MB 512MB
BASIC Web, Outlook, Word, Excel 256MB 512MB 1GB
ADVANCED Web, Outlook, Word, Excel, Graphics 512MB 1GB 2GB
HIGH Advanced graphics, CAD 1GB 2GB 4GB
* Not recommended

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