As we can see now - device limit doesn’t help to reduce lag. At all. Looks like there is some new problem in the game itself that causes lag when there are a lot of people(!) in the same playfield. Not devices.
Anyway device limit is the game-killer. When you have all your cargo boxes filled with all possible resources, the only thing you can do - build a giant CV with 500 turrets and use it in fight (on planets too). Now you are killing this moment of the game. For what? To fight lag? It doesn’t help anyway. Let people do what they want to do, leave it to the devs to think about performance. And they work, as I can see there is no more movement lag during fights with thousand of devices involved. The only problem is the delayed response for some actions. But you can’t fix this with device limit. Try it yourself - bring 10 people to one playfield without any ships - the lag will remain.
I hope you will reconsider this device-limit philosophy. At least - test 4.0 yourself when it arrive and make necessary changes.