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a guest Oct 14th, 2019 85 Never
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  1. (function () {
  2.     var overlay, lastCount, lastTime, timeoutFun;
  3.  
  4.     overlay = document.createElement('div');
  5.     overlay.style.background = 'rgba(0, 0, 0, .7)';
  6.     overlay.style.bottom = '0';
  7.     overlay.style.color = '#fff';
  8.     overlay.style.display = 'inline-block';
  9.     overlay.style.fontFamily = 'Arial';
  10.     overlay.style.fontSize = '10px';
  11.     overlay.style.lineHeight = '12px';
  12.     overlay.style.padding = '5px 8px';
  13.     overlay.style.position = 'fixed';
  14.     overlay.style.right = '0';
  15.     overlay.style.zIndex = '1000000';
  16.     overlay.innerHTML = 'FPS: -';
  17.     document.body.appendChild(overlay);
  18.  
  19.     lastCount = window.mozPaintCount;
  20.     lastTime = performance.now();
  21.  
  22.     timeoutFun = function () {
  23.         var curCount, curTime;
  24.  
  25.         curCount = window.mozPaintCount;
  26.         curTime = performance.now();
  27.         overlay.innerHTML = 'FPS: ' + ((curCount - lastCount) / (curTime - lastTime) * 1000).toFixed(2);
  28.         lastCount = curCount;
  29.         lastTime = curTime;
  30.         setTimeout(timeoutFun, 1000);
  31.     };
  32.  
  33.     setTimeout(timeoutFun, 1000);
  34. }())
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