Camera stuttering while 2d character falling only on mobile :(

Hi people. I am making 2d mobile game with UE4. A vertical tap Jumper . I have a lot of troubles with performance when launching on my phone. I’ve done everything with blueprints by tutorials . And I think the logic is hard for my phone or smth I don’t know. I switched off almost everything to optimize but It’s still the same. I am using a blueprint that I bought for Parallax Scrolling that was on the marketplace. And it works very good on my phone but Is there a chance that it can be one of the overkill in the game ? There is more things that I think I messed up. I made a blueprint that is spawning rocks from the sky and attached it to the character. The rocks are blueprint actors that when you touch or click on them , the character jumps on it. I made the rocks to destroy after one sec so the character starts falling. And there is where, when I launch on my phone the camera starts to stutter like crazy, while the character is falling. Playing it on my PC has no problems and I can’t find the problem. It’s very weird when you ave a problem just only on the mobile device and not on the PC too . For certain I am doing something wrong.I am not using physics for the rocks to fall so to save performance and instead I am moving them from event tick. But may be this is not the right thing. At least I can Launch and package with success :). But it runs so slowly too? Did i pick the wrong engine for this kinda of game?
Is there anybody who can help me ? Sorry if this is not the right channel for this questions! Here is some screenshots. The assets are still demo. Only the character will be the same.

- Gameplay on PC.
Is it too much for touched event?