When I paste a blueprint with elevated rails, the building of the of the rails takes really long and looks like it takes even longer when there are alot of them, for example this blueprint takes VERY long https://factoriobin.com/post/tof8fxaxv3ds-EXPIRES
Isolation is on full and all the other setting are on default

I adjusted the Async Tick Intervall to 3, so the wait time is not that painfull, has this significant impact on the UPS overall if it is doin nothing? Or would it be wise to increase the tick intervall later in the game?

I think I can look into this over the weekend. To answer your latest question, it's really only a problem for you if you notice it. It's easy to say that it costs more, but will that affect you? If it does, you'll notice then adjust; if you don't notice it, feel free to set it to however often or in whatever batches you like. My machine is well above average, so I tend to set defaults quite conservatively in favor of performance.

Thanks for the info. I think the problem here is that you cant place a random piece of elevated rail, they have to be placed in the right order. Bots are facing the same challenge.

Right, so the technical problem is that there is not a proper ordering of the ideal build order; the game doesn't even know that, so it would have to be a Lua-based implementation. I'd have to see if sorting the queue is fast enough that it doesn't introduce performance issues, or perhaps if it could query for more specific ghosts in a tiered fashion.