refactor: more accurate tick

client/index.js

@@ -72,12 +72,16 @@ const messageHandle = setInterval(() => {
   }
 }, 1000 / 60);
 // Prediction.
+let lastTime = performance.now();
 const predictionHandle = setInterval(() => {
+  const now = performance.now();
+  const elapsed = (now - lastTime) / 1000;
+  lastTime = now;
   if (hasSelfEntity()) {
     selfEntity.inputState = actionState.toJS();
   }
-  entityList.tick(1 / 60);
-}, 1000 / 60);
+  entityList.tick(elapsed);
+}, 1000 / 80);
 // State updates.
 let dirty = false;
 function onMessage({type, payload}) {