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In most traditional clamshell laptops the processor is in a socket rather than soldered to the motherboard, and in principle, can be fairly easily replaced. You might want to do that if you believe that a faulty processor is causing frequent crashes, though it would be hard to make that diagnosis with any level of confidence. You could perhaps fit a slightly faster processor to bring it up to the specification of a more powerful variant of the same model of laptop but it's doubtful whether the effort and expense would be worth the benefit.