Indeed, has potential to rejuvenate older phones, albeit from custom roms. But I'm still trying to find the minimum specifications for this flavour of Android. Anybody have any ideas?

It's probably going to be a feature present on the latest low end SoCs from Qualcomm not present on SoCs prior to 2016.

You could add config_lowram to your /system/build.prop . reduces animations but much faster.

You can run Lineage OS on Nexus 4. There is already beta version built on Android Oreo. Nexus 4 is has 2 gigs of RAM and decent CPU. So not exactly target for this Go thing.