Whenever playing the newest version of minecraft bedrock edition, if a pop-up appears it will cause immense frame drops often dropping from 60 frames to 20 in intense areas. Ive noticed that while you are in a party with your friends and you have a semi-intense area that normally won’t lag at all it causes intense game lag. It also happens when you get a notification or opening the xbox menu by pressing the xbox button on your controller then going back to Minecraft.
As you can see in the video my game is running smoothly while playing however as soon as i open the xbox menu and go back to Minecraft it causes it to drop around 40 ish frames
This issue is being tracked at MCPE-199201.