How could we possibly overlook this one? Nobody enjoys staring at the buffering action. It doesn't matter how fantastic your design tool appears or feels if your website takes forever to load. The average user waits 5 seconds for your page to load. All of your well-designed front pages and drop-down menus will be for naught. So, don't make your consumers wait any longer, and make your Magento product designer tool light enough to drive quick speed while providing an excellent user experience.