Be sure to follow the factory maintenance schedule (or better)... just not at the dealer
In your specific case, since you mention poor performance, in addition to the stuff mentioned before, I would replace the air filter, spark plugs, and battery at this time. I would replace the two belts, also, just because we don't know when they were last done.
After this you will be good for some time!!! Our engines don't need expensive timing belt services or anything exotic.