If there was unlimited memory and processing power, you wouldn't have to optimize your GIS services and I wouldn't have written this chapter. However, unfortunately, we do have limited resources and we have to use them efficiently to get our services to run comfortably. In this chapter, you have learned a number of approaches to optimize your ArcGIS for Server. You now know that careful planning and analysis is required to select the correct parameters and preferences that will make your Server run at its optimal state. The techniques you learned, namely pooling, process isolation, and caching are sufficient, if used as guided, to bring the most out of your ArcGIS for Server and make your GIS services run much more efficiently and effectively. In the next chapter, you will be introduced to the clustering technique. This will help you group and categorize your GIS servers in order to use them more effectively.