Zen Cart Performance module greatly increases performance of your Zen Cart-based store. How much speed do you get - some examples: Large store with 12 000 products and 1279 categories. Before performance optimization: 4.33 sec. After performance optimization: 0.64 sec = 676% increase! Medium-size store with 800 products and 23 categories. Before performance optimization: 2.23 sec. After performance optimization: 0.41 sec = 212.38% increase!