Hi there,
I can help out optimizing your wp online bed store site.
The workflow usually involves caching it from wordpress site (via w3totalcache or other similar plugins) or if you are using vps at the moment, via varnish. The latter generally gives way better improvement.
If you are expecting million hits perday, then you could think of hosting it in several instance and use a load balancer to distribute the visitor.
And lastly, to help reduce the server load for images and other assets, you could think of using cdn.
My bid is for the full service to make sure your website load super fast.
Do let me know if you are interested.
Cheers!