How to change native Resolution on MBP 2015 running Mojave? My problem is I would like to change the native resolution of the built-in screen of my MBPR 2015 running Mojave to 1920 * 1080. The thing is I don't want the output to be scaled, I just want this resolution to gain performance. Any way to achieve this ?

Thank you
While you can't "change the native resolution", you can use the displaymode command line tool to change to the native resolution instead of scaled resolutions.

Download the displaymode binary from the "releases" section on github, and extract it if necessary.  Then from Terminal.app, cd to the directory the displaymode file is in and run:

./displaymode t 1920 1080


You can also run:

./displaymode d


to get a list of supported resolutions.