Shield's autoloading performance

I am starting with Shield. After successful installation (Composer and Spark) I realized, that Auth helper is autoloaded everywhere. I need it only in admin panel, nowhere else. The documentation is saying, it is autoloaded by Composer.

1. Is it possible to load Shield only where I want it?
   
2. Does autoloading in Composer have impact on performance as level 1 optimization is enabled by default?
   

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I realized, that Shield's dependency Settings library is always sending database request for settings table, even if I am not using neither the Shield or the Settings library. This behavior is unwanted for me. (Edit: It was my mistake. It is not doing this.)

CodeIgniter 3 and less was great, because it was not loading anything "for me" until I specifically asked for it. I know, Shield is not essential part of CI, but this behavior looks like Laravel style, which is leading to bloating software, which I really do not want and I am suspicious on CI too now as Lonnie is an active member of the community. I really hope CodeIgniter is not heading this way, because why should I use Laravel style framework, if I can use Laravel directly? And why should I use Shield, if it is doing stuff "for me", which I really do not want?