if(window.navmet===undefined) {
      window.navmet=[];
      if (window.performance && window.performance.timing && window.ue_t0) {
        var t = window.performance.timing;
        var now = + new Date();
        window.navmet.basic = {
          'networkLatency': (t.responseStart - t.fetchStart),
          'navFirstPaint': (now - t.responseStart),
          'NavStart': (now - window.ue_t0)
        };
        window.navmet.push({key:"NavFirstPaintStart",end:+new Date(),begin:window.ue_t0});
      }
    }
    if (window.ue_t0) {
      window.navmet.push({key:"NavMainStart",end:+new Date(),begin:window.ue_t0});
    }