Will these GUI libraries or services bring some bad effects for the system? reducing performance?
No, a library is just a library they take place of cause, but no performance, if you don't call routines from them.
services (on unix you call them daemons) are something else.
But what exactly are you talking about ?
Please make an example.
Are you talking about compile a program in lazarus, and then run it on a minimalist system ?
Are you talking about console-apps ?
A funny thing is to have a program that probes if there is a X-System and otherwise uses FV to do the same things in a console.