A little update now, I've moved the servers a while ago to a new webhost, DigitalOcean, where we are currently being hosted on the smallest VPS without any issues (it's working really smooth and the site is a lot faster too).

 

There were some issues just after the move where we would run out of RAM, and MySQL would crash because of that, but those issues are now also resolved and shouldn't occur (adding a bit of swap does miracles). If needed, I can always upgrade our server.

 

Also, I'm working on a new version of the portal, as I find the current version very slow (it's the theme, which has way too many features which slows everything down).I have been working on a new version for a while now, and I'm still working on it so I hope I can launch it as soon as I'm glad with it.