Having many entities and mobs normally cause lag spikes even before the implementation of the Renderdragon, but now just even having more visible blocks on the screen would cause lag (looking up to the sky prevents the lag) as if the screen is looking to a tremendous amount of entities/mobs.
Having many entities and mobs normally cause lag spikes even before the implementation of the Renderdragon, but now just even having more visible blocks on the screen would cause lag (looking up to the sky prevents the lag) as if the screen is looking to a tremendous amount of entities/mobs.