So I recently have been working on a game. So far I have very few assets in the game, which are a point light, a piece of terrain (which is textured), a player controller and a tree. Everything was going well until I put the tree in the scene. I made tree and started to add some branches I got to about 8 branches, and then I added 35 leafs. Then the edit scene started to become laggy. When I played the game it was running perfectly. But as soon as I changed the scene back to edit mode it became laggy again. I then deleted the tree to see if that would solve the problem but it seems to have done nothing at all. I would really appreciate if someone could explain why the edit scene is becoming laggy even though there are only a few assets within the game.