Investigate and resolve user experience issues using W3 Simulator. Learn how your site performs under various network conditions like: connection speed, packet loss, network utilization and so on. And even investigate the benefits of file optimization, white space removal, HTTP Compression, connection parallelism and so forth. If you have a high traffic site, make your site bulletproof by seeing how your site performs during peak times of the day or explore how your pages render when using different browsers.