I imported a model in Unity and checked the “generate colliders” option on the inspector so the player doesn’t pass through it.
After waiting a lot of time for the colliders to be applied,I turned to game mode.
The thing is after the colliders are generated,when I get close to the object,the frame rate drops to less than 1 frame per second for some reason. The game just freezes for several seconds.
Why is this happening ? Is it a bug or am I doing something wrong ?
Is there a workaround other than manually adding a box collider and editing it for every single copy of the asset I use in the Scene Window ?
Please help,my game becomes unplayable. 
Are your models very high poly?