After recently updating to the latest version of the kit, we've found that when working in a scene with many (50+) 2dtoolkit sprites, working with them is extremely slow. Just selecting a sprite game object in the Hierarchy can take whole seconds before it registers, and trying to rename or change the game object's parents likewise takes several seconds to complete. This makes working with the kit really frustrating. We saw no issue with 2d toolkit before the update and were very happy with it, and now we're tearing out our hair.
What happened in the recent update that could've caused this?