A few friends and I play on a dedicated server using a multitude of devices. Since the upgrade to 1.16.100 we have had issues with lag playing the game. The platforms we play on are Windows 10, Android, and iPhone. Before the upgrade there were no lag issues. But after the upgrade we have all experienced problems with lag in the game. For some troubleshooting I downloaded the world and tried it locally. The local world also has problems, so I don't believe it's a server issue. 

The only difference I can see between the two servers, except for the version, is that server-authoritative-movement is set to server-auth. I set it to client-auth, and users informed me that they saw an improvement, to the point it is playable again, but the lag is still there. Currently, it spikes for users at various times, Not really affected by where they are in the game. 

I'm not sure what I can change client side to try and improve performance.