New York--Engage Technologies said Monday it has upgraded its Web site analysis and added rich-media ``superstitials'' to the mixture. Engage, Redwood City, Calif., said its Internet Profiles Corp. (I/Pro) subsidiary will offer a service called Velocity, which measures user experiences on Internet sites. Velocity will measure how quickly a site is contacted, begins to download content and when it finishes loading all objects on a page. In a separate announcement, Engage said it will work with Unicast Communications, New York, to allow advertisers and media buyers to generate targeted superstitials--Internet advertising that eschews banners and pre-caches audio and visual information for quick delivery. The move will join Unicast's technology with Engage's database of 35 million Internet user profiles.