The lack of speed is probably due to the site rather than Safari. Here's what the site says when I go to it on a computer running FireFox:
"MLXchange was specifically designed for Internet Explorer versions 6.0 or greater. Your browser version is not supported. To download the latest version of Internet Explorer, visit the Internet Explorer Downloads Web site.
Once Internet Explorer is installed, you can go to the MLXchange site by typing http://www.mlxchange.com into the address bar."
Internet Explorer is not available for iOS devices, but there are plenty of alternative browsers in the App Store.