I didn't play around with the render threads much. The basic idea behind this was restricting factorio to less cores to get more cache hits. But if I restricting the use of the other cores anyway it makes no sense to have 8 rendering threads. This was the reason, why i changed it down.Let me check if something else uses max render threads as a limit.
I at first changed restricting strictly to one core what made things worse instead of better. Than I tried a little bit around. The main result is: Using 4 cores seems to work much better than using one or 8. This was strictly done on OS-Side. Not within factorio. – I just changed the rendering threads to the same value.
This is not true. I would be really interested in answers to the original Question. What do you need to play huge maps. The only answer to that question came from Jap2.0 saying that he can play with a much slower CPU.Since help is not what seem to be looking for I will close this.
Everybody else just got his own topic: BlueTemplar insisting that the CPU is way below average also it would be ranked on place 25 of 100 of the most common CPUs in his own source. (A benchmarking software which has for sure an other user circle than the normal office-user.) And CrushedIce who started discuss about performance optimization and at last posila who seems to be much more interested in how you could optimize the game. I answered to these off-topic things. This does not mean, that I'm not interested in an answer to the original question. – Should I try to make a different tread which stays more on topic?