how can I use Xcache for my forum?


Well-known member
For a new VPS, you should be using php7 which comes with opcache (xcache upgrade/replacement) functionality as standard.
Enable it, and XF (or any other web app) will use it automatically - it's php that controls it, not the web app.


Well-known member
The VPS will be running Ubunto 14.04 with Plesk 12. I'm assuming I can upgrade PHP to 7. What are the advantages of this?