document.onload = onloadHandler;
did not worked. Tried

window.onload = function () { 
  google.load("visualization", "1", {packages: ["corechart"], callback: 
drawCharts});
  
  var t1 = 'IndexTitle'
  var t2 = 'IndicatorTitle'
  function drawCharts() {
    drawChart1(t1);
    drawChart2(t2);
  }
}

and it worked. Also, now I was able to change

<script type="text/javascript" src="https://www.google.com/jsapi";></script>
to

<script type="text/javascript" src="https://www.google.com/jsapi"; 
async></script>
which pushed the Google PageInsite score from 49 to 82. Still Google page 
insight shows

Optimize CSS Delivery of the following:
https://www.google.com/…bdd6ab2d343a51d49841bf93d022fb/ui+en.css
https://ajax.googleapis.com/…static/modules/gviz/1.0/core/tooltip.css

as I understand these CSS are loaded when

google.load("visualization", "1", {packages: ["corechart"], callback: 
drawCharts});
is called. How do I optimize that?

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