Hello,

i playing on my PC the Minecraft Bedrock edition, so i can play with friends. if i dismantle coal, trees or harvest, than are lying items around. for example on an automatic farm. And if there are too many, then drops my Frame rate to 2 or 3  FPS (2-3FPS just on the automatic farm). the framerate already drops with a few items, but remains fluid. 

I tested it offline on a flat world and it happens again. in the Java version is everything stable.