Working on a Compose layout, and using Box. But I need to align with the screen size, so I tried BoxWithContraint. But when I use that, it appears to be in a constant update loop (Box does not do this), which kills performance. Any tips on how to perhaps speed this up, or get the screen width for the plain old Box?

Can you share some code? It should not do it by default.

It is quite a large compose tree. I will try to start a new sample and build it up until I see the issue.

Okay. The problem could be that something reacts to the constraint of the box (as expected), but in turn it updates the layout containing the box, hence the infinite loop.