Hello
the top part of the flower mesh has 550k vertices - when running compression we will automatically create mesh LODs for you but you need to enable AutoCompression if you need automatic LODs for your development server.
You have multiple options to improve this if enabling compression for your dev server is not an option:
A) You can optimize the model and manually create LODs
B) You can set the blossom to the IgnoreRaycast layer in Unity and add a invisible proxy mesh as a child that you use instead for raycasting
C) You could add collider meshes (e.g. BoxCollider) and use the physics.engine.raycast
I hope that helps