Hi, I downloaded the following from https://github.com/BonbonLemon/basketball.. Why is it everytime I played the game in the chrome browser/firefox after 1 minute it started to become laggy, Thanks   <!doctype html> <html lang="en"> <head>     <meta charset="UTF-8" />     <title>Basketball Game</title>     <script type="text/javascript" src="js/phaser.js"></script>     <h2>Basketball Game (inspired by Facebook Messe