During the weekly Siege War, up to 150 players can fight together in real-time to conquer the Castle of Hilberk. Combined with the NPCs and catapults, the Siege War is very demanding in terms of processing power for all devices and can create some "screen lag" andeven disconnections in some cases.
To reduce the possible "screen lag" it can be highly recommended to:
– kill any other app that may be running in the background,
– go to settings and deactivate other players’ effects, other players’ titles, and characters’ shadows
Note that these tips can also be useful against World Bosses when lots of players may gather at the same location