No, it's been slow for a long time now I just got annoyed enough to ask if there was something I could do.
It becomes normal if I wait a while with the tree open. My big trees have several references to other trees if that matters.
It doesn't happen in my other projects, just in this one with a lot of trees. I'm planning on adding more and more behavior trees so I'm worried the waiting time is just going to keep going up.
If there's nothing to be done I'll just live with it but I thought it'd be dumb if I were waiting around for these trees to load into memory (I'm assuming that's what's going on since after I wait that long time, all the trees become snappy) if there's some setting I can change to make it faster.