This is a virtual server (Apache/Nginx/PHP) on digitalocean.com, with perhaps 100x X3 websites and Files Gallery demo, behind Cloudflare (does some basic image caching on CDN). It's only around $20/month with 2x CPU, nothing particularly powerful, and it's mostly running < 10% CPU. Of course, the demo has everything cached already, so there are not much processing going on in PHP.
