iOS Build is super laggy but WebGL runs smooth on the same device

As described in the headline, I built the same game for WebGL and for iOS.

When I started the game on the iPad (7th generation, OS 17.7.1), the game was extremely laggy.

So I thought maybe the iPad is too weak to handle the game, although it is just a simple 2D game and it runs well on Android devices. The most “fancy” feature we use is the pathfinding navmesh.

But then I played the WebGL build ON THE SAME DEVICE and it ran smooth.

Any idea what could be the culprit here? Maybe certain settings that are unique to iOS?