How do I make an Anti-Blackhole Exploit Script without :SetNetworkOwner()?

In my game, setting the Network Owner of all parts to nil makes them fall at slow motion and makes the game feel laggy, as well as making input lag occur.

Is there a way to fix the blackhole anti-exploit without using :SetNetworkOwner() and without using any local scripts?

No, The reason its laggy and slow is because of the fact its being changed on the server and the delay between the server and the client is pretty large. To fix this you must move the character on the client in a local script.