[Q] Arcane Legends Strange Behaviour

So I manage to install Arcane Legends on my Lumia 920 with build 10512. Surprisingly, it connects to the servers to download packages for the game and to go online. So everything is running smooth until I get into the game.

So this is where the strange behavior comes in. I observed that when you are not touching the screen, everything runs smoothly because you can observe the other characters is walking fluidly. But here comes the ugly part, when you start touching the screen, like moving the character, it lags like hell! It's like running GTAV on an obsolete computer with just onboard graphics.

So the question is, why is it doing that? What a waste of chance to play this on our beautiful Lumia [or Samsung, htc, etc..]. What's causing it? why a game so smooth suddenly lags when you just touch the screen of your phone. Is there any fix to this? Am I the only one having this issue? Please share your experience if you have tried this game.

Thanks!