Loading a lot of list items in the initial value when you have any node transform registered causes UI to freeze #5589

Not sure if this can necessarily be considered a bug, but I think this does need to be looked into.

If you have a lot of list items in your initial value and have any node transform registered, even the ones not registered for ListItemNode, it will block for a long time. The more transforms you have, the worse it is.

Here is a profile of the playground running locally with a large number of list items in the initial value:

Removing most of the transforms brings the time taken much lower:

From what I can tell, it has something to do with the transform() method on ListItemNode (initially added here #4030)