If you see a lot of time spent in
      resolving the target platform, you can set up some p2 mirrors on
      local filesystem and enable them for Tycho via settings.xml. See
      
http://wiki.eclipse.org/Tycho/Target_Platform/Authentication_and_Mirrors.
      It would replace all remote access to Nexus proxy by a filesystem
      access, so it can save a lot of time.
      For JBoss Tools, we also set up the concept of "unified" target
      platform which avoids referencing too many sites from the target
      platform. This unified target platform aggregate all the content
      of the various sites we need, and put them in a single location.
      Having a single location makes dependency resolution a bit faster.
      Those possible improvements to target-platforms are explained
      here:
      
http://www.slideshare.net/mickaelistria/a-journey-with-target-platforms
      .
      
      But there may be some other time-consuming operations. You'll need
      to actually look at how build happens and find which operations
      that the most time to figure out what can be improved.
      
      HTH