Time between updates is measured and used to compute resource gain. Food is in title now

gorge.js

@@ -14,6 +14,8 @@ let updateRate = 60;
 
 let currentProductivity = {};
 
+let lastTime = 0;
+
 function calculateProductivity() {
   let productivity = 0;
   for (const [key, value] of Object.entries(belongings)) {
@@ -72,8 +74,13 @@ function buyBuilding(type) {
 // update stuff
 
 function updateDisplay() {
+
+  let newTime = performance.now();
+  let delta = newTime - lastTime;
+  lastTime = newTime;
+
   updateProductivity();
-  addResources();
+  addResources(delta);
   displayResources();
   displayBuildings();
   displayUpgrades();
@@ -85,11 +92,12 @@ function updateProductivity() {
   currentProductivity["food"] = calculateProductivity();
 }
 
-function addResources() {
-  resources.food += currentProductivity["food"] * 1 / updateRate;
+function addResources(delta) {
+  resources.food += currentProductivity["food"] * delta / 1000;
 }
 
 function displayResources() {
+  document.title = "Gorge - " + round(resources.food) + " food";
   document.getElementById("resource-food").innerText = "Food: " + render(resources.food);
 
   document.getElementById("productivity").innerText = round(calculateProductivity(), 1) + " food/sec";
@@ -512,5 +520,7 @@ function buildingTooltipRemove() {
 window.onload = function() {
   setup();
 
+  lastTime = performance.now();
+
   setTimeout(updateDisplay, 1000/updateRate);
 }