Swap is used to defrag ram on linux. Could be related to that. In any case this is pretty normal. I have 43Gi available and it is used 700Mi of swap.

TCL?

I suppose that is true. Intel seems to think so as well as their low power n100 is about the performance of a 1500x.

Sure, not much per gen, but if you compare say a 1700x vs the current 9700x, you are roughly looking at a 3x improvement in single and multicore performance increase.

I will just say it uses an ARM A5 which was introduced in 2011. It is 32bit processor which could be problematic as most linux distros are moving or have moved to 64-bit. And most importantly only has USB2.0 ports.