Which linux services can I turn off to improve Real time performance?

Technical Support
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1

I am running the kernel version:
Linux colibri-imx6 4.1.41-rt48-2.7.4-rt+g82f0f4f #1 SMP PREEMPT RT Fri Dec 1 15:42:52 EST 2017 armv7l GNU/Linux

After boot with htop I see a number of daemons/services that launch automatically on boot. See attached.
I need SSH login capability primarily for the application. I know I can use systemctl to turn off LXDE. But I do need guidance on what the other services do (for e.g. snapd, avahi-daemon) and which ones I can turn off safely.
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Real-time performance is unlikely to be affected by any of this services.

Every service provides some functionality. Which one you can disable ultimately depends on your use-case and what feature you need.

If you need a minimal image I would recommend start with the console-tdx-image.