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What causes computers to become sluggish or ‘hang’?

Your computer may be performing sluggishly due to various reasons associated with its hardware and software. While there’s not much you can do to maintain the hardware (except upgrading its memory capacity, for instance), maintaining the software can keep it running well. Regularly defragmenting your hard disk, or being extra careful about the type of software that you install in your computer, can help to improve its performance.