Ubuntu 14.04 with plesk Tuning for web apps


Can some body give me some tips to tunning my web server for best performance with web apps. I have ubuntu 14.04 with plesk 12. Here some scrren shoot of my settings in plesk under my web apps domain.


Did you notice that you have memory_limit set to -1 and that the help tag says that it’s not recommended?

Yes, i change right now to 1G. Other tips???