Server requirements for server-based compression

Hi,

I moved to a new server, and your plugin is saying it does not meet the minimum requirements. I can make changes to this server (it has 4GB RAM, 2CPU cores, running on Apache – and it’s never overloaded),
but what are the minimum requirements? I can’t seem to find them anywhere.

Can you please specify your minimum requirements for server-based compression?

I can also install Apache modules

Your plugin is giving this error:
“Your web server does not meet the requirements for free server-based compression. You may start your premium trial for 5x more compression, PNG/GIF/PDF compression, and more. Otherwise, continue with free cloud-based JPG compression”

thanks a lot