I'm still using an older version of UE4. The current version has a completely revamped destructible system; I haven't tried it out yet but hopefully it's better than what's in 4.19 (this version). The destructible mesh physics absolutely crush even higher end PC setups. That is the only reason for the cooldown -- and yeah, it's annoying. You should see what it does if I allow you to throw as quick as you can click the mouse!