Computer and LinuxCNC latency test

Hey, linux noob here! Been experimenting with latency on 2.7 weezy and would like to see if different version gives different results, so- how to run latency test on mint Xfce? I run it from USB.

See here for installing Linuxcnc on Linux Mint (which is really the only option now) forum.linuxcnc.org/9-installing-linuxcnc...-installation#137159

Unless you can get a version of Linux Mint with Linuxcnc pre installed with a real time kernel there isn't much chance of testing Linux Mint & Linuxcnc on USB.
Whilst it would be possible to install Mint to a USB drive it's not a simple issue.
BTW Mint 19.3 is the latest release of Mint that doesn't require a lot of jumping through hoops.
RT_PREEMPT will usually give a latency not as good as RTAI.

It really depends on whether you wish to use the Parallel Port or a Mesa solution.

RTAI for Parallel Port
RT_PREEMPT for Mesa

This is just a general idea.