It doesn't always happen, but sometimes when several effects happen on screen the game's FPS will drop (120~ to 60~) and there will be what feels like significant input lag.
It happens a lot when I'm carrying the urn and I drop it, sometimes without other effects on screen.
The lag stays after the effects are gone, but disappears if the game is restarted.
When it happens, I've noticed that the lag momentarily goes away if I go to the spawn and look away from the map. So if I go to my spawn and look away from mid boss, my game will go back to my normal FPS. When I turn back and look in the direction of mid boss (still in spawn, so just the shop on screen) the lag comes back right away.
It happens a lot when I'm carrying the urn and I drop it, sometimes without other effects on screen.
The lag stays after the effects are gone, but disappears if the game is restarted.
When it happens, I've noticed that the lag momentarily goes away if I go to the spawn and look away from the map. So if I go to my spawn and look away from mid boss, my game will go back to my normal FPS. When I turn back and look in the direction of mid boss (still in spawn, so just the shop on screen) the lag comes back right away.