LevelDesign + best solution

Hello, i start create level for my 2D game. My game based on grid coordinations and for each coordinates i create object with hex texture (ex2D sprite object) but when i have ~60 hex objects on scene fps realy slow down (12-20 fps). When i disable tile fps like ~60. I think the better way is create all level in graphic program and in unity set collider. But i dont know is a good idea. Somebody design level on this way ?? Really thanks for answer.