Pc version is still laggy... Why isn't a 21.7.2a android version? Is it existing? Because the pc version seams to poorly optimised... It's surrealist to see a game with litteraly zero graphics power needed being this laggy even on a decent computer... And it's already been a year or more that this issue is there and that they don't fix it yet...
Well, this we're long over with.
The thing is rather complex - but;
1. Graphics have basically no meaning for the overall performance of a game - rendering is only one part of games - so it's only 'surreal' for a game with next to no 'graphics' to have bad performance coming from the CPU-side of things if you understand absolutelly nothing at all about computers. But with such a lack of understanding it will even feel 'surreal' to live on a sphere and not falling down when traveling to Australia...
2. The next layer of complexity that comes into play after the rather simple differences of GPU, CPU, Data-Throughput or -Bandwith, etc. is the engine used. Not every engine, not every framework, not every coding language shows the same performance - not overall and most definitely not if you compare different types of applications - you can't even expect different coding languages to manage to solve the same mathematical calculations with comparable speed and performance...
Ergo; from how things are now I would say it's a safe bet that the performance issues actually wont get any better but most likely even worse. Unless there is a switch to another engine/framework or RimPy pushing a backwards-compatible update that improves things massively I doubt it's something that can easily improved just on the code-side of things.
I have to admit that I still haven't looked into the files close enough to find out what exactly is causing the slowdown, but I have some suspicions based on what is known about RimPy's strengths and weaknesses and I don't think that there is an easy solution if it turns out that's really the reason.
That said - the game runs fine for many of us - so you can expect that in reality there are at least two or three additional complexity layers to the issue...