Need help with instanced mesh collision

I really need help on this problem, can’t find a single resource about it. I have several hierarchical instanced static meshes. Problem is there are so many instances that adding collision essentially cripples the game (~100,000 instances in total). A user on the forum here mentioned batch collision processing but I have no idea if he was just guessing or if that actually exists. I need your help UE4 community as I’m at a loss on this one. The hism’s are essentially asteroid fields.