FPS drops when running vs standing still

Hello, I have a problem with fps in the mobile version of Minecraft. I run in minecraft when the chunks start to appear, my fps drops, I stop and the fps becomes normal. I played Minecraft Preview on Xiaomi 11 Lite 5G NE and I can't mean why I have lags on my mobile phone.

When I'm standing I have 150 fps.
When I run, I have 40-30 fps.