Lag spike (frame drop)

I don't get it, my phone runs 120 fps and I switched it to 60 fps on Minecraft. But there's still frame drop when running around and exploring the world, basically happen when you load chunks, the frame drops to 58-55 frequently. Not to mention I can literally run 3d games with high shaders with no absolute frame drop at all. But a PIXELATED game manage to do that. It need more optimization, even with the lowest settings it still occur. Makes exploring unsatisfying