I changed the functions options and can now view the server audit. Here are the findings:

• disable_functions = symlink,exec,popen,system,dl,passthru,escapeshellarg,show_source,pcntl_exec - FAIL (must be without shell_exec,eval,assert,phpinfo,getenv,ini_set,fsockopen,chmod,parse_ini_file,readfile,escapeshellcmd,fput,popen)
• PHP accelerator = - WARNING (The script can be much faster if you install some PHP accelerator)
• Server-side content compression - ...
• To apply this optimization you need to have deflate_module - FAIL (you will need to install deflate_module for Apache)