Cambio de procesador

cpu-upgrade.com type in X5650 A list appears that gives you alternative CPUs. Also an estimate of likelihood of success. The best alternative appears to be an X5690. This gives you a 17% increase in speed ( www.passmark.com). X5690 CPUs seem hard to find on ebay. It may be hard to find a CPU that gives you much improvement. How much memory do you have? If you have less than 8Gb, upgrade memory. What kind of storage device do you have? If you have an HDD, upgrade to an SDD. Other than that, you may be at the limit of your computer's speed.

I suspect that your computer is about as fast as it can go.  If you can find the faster processor you might realize about 15% improvement in some tasks. In others, none.