It seems like you are using Microsoft's Internet Explorer, which doesn't support the new HTML5 standard and is slooooow.
Installing one of the Browsers mentioned above is absolutely free and secure. You don't have to trust me on this - if you are unsure what to do, please ask a computer geek from your friends or family.
If you are already using Firefox, Opera, Chrome or Safari - please update it! The game runs fine in the current version of these browsers.
There's nothing else I can do, sorry.