This will throttle add unit's replace the lines 196 to 198 in inspector.js with this:

patch.js

        // XXX REMOVE ME - I'm only here to throttle unit creation to test UX
        var self = this;
        for(var j = 0; j < delta; j+=1) {
          setTimeout(function() {
            console.log('settimeout');
            // Keep me but swap self for this and 1 to delta
            env.add_unit(
                service.get('id'), 1,
                Y.bind(self._addUnitCallback, self));
          }, j * 1000);