Those graphics cards won't work. Neither one of them. Anything you'd add into CPU side will be killed and lost twice over because GPUs don't have enough VRAM.

This kind of simulation games always need CPUs with higher possible single core speed. So latest 9950X or 14900K would be the best ones for this game. And for any other similar simulations.

The lag is a big issues that the devs are working on in the next game update from hints they have been dropping on the discord server: https://discord.gg/ShqSSEK
They have not mentioned a release date as of yet, but did say when they get closer and know they can meet the date they will announce it.

That's a bit of a museum piece of a CPU (Haswell Xeon). I had a desktop equivalent of the CPU (HEDT).

When I upgraded the system to AMD 7800x3d, there was a big jump in performance for Sim Airport. Also, allowed airport to grow to higher pax count without too much stalling.

Even better would be newer 9800x3d.

As far as memory, you are nowhere near maxing out on memory. 32 GB or 62 GB are fiine for desktop.

Ryzen 7 5800x here and SimAirport runs just about flawlessly. I notice at times when ramping up time acceleration to max, it will slow down a bit at times but it appears the game is doing it because the time acceleration numbers change. Other than that it runs pretty well. And I must say with everything that is going on I'm pretty impressed by what the game engine can handle. There are a LOT of sprites on the screen. I use the old sprites from back when they were in Early Access so maybe they perform better. Idk why but I really like the look of the older sprites as opposed to the new ones.

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3565268334

If you look at my baggage claim (and yes this is AFTER I tried to make it less congested) along with everything else that is going on, it is pretty impressive from a technical standpoint. That is a lot of sprites in the screenshot. I think the old ones are more efficient b/c they don't really have a walk animation and instead they just kind of scoot along which will save on memory b/c no need for walk animations. Adding more images should not take that much more memory since they would just index into an master image array or list for the extra images to make the animations.

Overall, I'm very impressed by this game. It is cartoon-ish but not shallow. It has a lot od depth to it and it definitely has that all important 'just need to change one thing and it will be perfect' vibe to it that drives you to keep improving your airport.

Originally posted by Bjorn:

Hello,
I love SimAirport, but the lag of the pax when getting a bigger airport is still a issue.
Played on a windows (I7 processor) and macbook pros (last was a M2 chip).
Always the same thing, when getting roughly 8 XL gates, the lag starts to kick in.
Now, I have a workstation with a Xeon E5-1650 v3 processor (6x3.5GHz) with 128GB(!!) RAM.
Does anybody know if this would be better? Or even worse?
The graphic card isn't that huge (Nvidia Quadro K620 2GB), but I could replace it with a HP NVIDIA Quadro K1200 4GB.
I was thinking that maybe the CPU was the most important thing in this game?

Yes CPU is important but if your GPU is lacking behind so much it bottlenecks the CPU and RAM.
As you said you are using workstation hardware for gaming. It's like trying to win a F1 race in a dump truck.
1. While the CPU and RAM should be good enough your GPU (both of them) is absolutely NOT able to run modern games besides maybe some mobile games and it's way below the games requirements.
You need at least an rtx 970 as said in the recommended specifications. Your GPU is way too bad. Possible other old GPU would be RTX 1060 6gb or any higher Nvidia card if your Main-Board can handle them and you can get one cheap. But if you put such a gaming card into your workstation most likely your power supply (PSU) will not be able to provide the power it needs...

https://gpu.userbenchmark.com/Compare/Nvidia-Quadro-K1200-vs-Nvidia-GTX-970/m28490vs2577

note from the devs on rendering settings:

V1: old renderer, uses mostly CPU to calculate the agent stuff and is rather old (it's basically the original renderer for agents)

V2: offloads some calculations to the GPU but requires some specific newer technologies in the graphics card (most modern cards have them) but is limited to a specific amount of agents

that limit is generally not noticable in normal gameplay, except when your airport can't get the pax out and they get punched up

there's a notification for when this happens (i.e. when the transport capacity is reached) so players know about it quicker

the AC is just Agressive Culling - it tries to only render agents on screen rather than all which may cost some CPU usage again but if a lot of them are off screen saves on GPU time