MichaIng Thanks for your comprehensive response. If it’s not supported that’s OK for me. If supported, I would have used it. It’s always nice to disable stuff you don’t need. 
In comparison to my old 3B+, the HC4 is a huge improvement already, even without this optimization. Instead of 1 MB/s download (with TLS) I can now fully utilize my Internet connection. Combined with the Emby server, it replaces three devices (3B+, NAS, Shield TV).
Thanks again for all your work on DietPi. It really makes setting everything up a breeze. I’ll continue to support you on Patreon.