- 2GB DigitalOcean droplet (for development)
- nginx 1.7.2 (built from source with SPDY, PageSpeed)
- HHVM 3.1.0
- enforced sitewide SSL/HTTPS
I've tested my site without SSL enforced and the result was the same. To check if the problem was related to Xenforo, I setup WordPress on my server and sure enough, it loaded fine. Each refresh or page visit didn't cause HHVM to take up all the server's memory like Xenforo did.
I've also tried editing my nginx configuration files to no avail.