High Ping Occurs When Building Right After Game Starts on UEFN Converted Map

[ryryo]

After reading this post, I also temporarily removed Guard spawner and the bug no longer occurs.
I still don’t know how to solve it, but here seems to be the cause.

Guard spawner cause lag spikes when placed in a session

I was placing a guard spawner in my UEFN session and then i was getting some lag spikes every 5 seconds and does the same thing during the game. Is there anyways to avoid this except removing the device?