Untangle won't improve the speed of your Moodle site - which is either on your own private server or on a Web Hosting company's server. Untangle will help you to block unnecessary website surfing and unproductive protocols like (IM, Peer-to-Peer or gaming services). So in effect, your Internet access is controlled. So when your users surf to a Moodle site, the experience is smoother and faster. The free-version is not fool proof, meaning that there are ways to circumvent the blocks, but there's always the premium package that comes at a monthly fee.
Untangle is a software appliance that manages every aspect of network control from content security to web caching, remote access to policy enforcement, all from one simple, drag & drop command center.
Figure 1: The Untangle solution - it's free unless you install some of the premium modules