Problem: Game crashes when portaling past two days. Today for past 10 hours severe lags with mob twirling and villagers unable to path find. Dogs (i don't have any other mobs) walking slow with jerking movements and wandering into sweetberries/water etc where they are damaged.  

Attempts to fix:

Deactivated all add ons. Used just Minecraft update texture pack but no difference. restarted computer several times but no difference. Switched to JAVA version and played there for awhile. Had no problems. (Thought it might be my computer so I declutered, cleaned etc.)

Tried Beta Bedrock over different terrain as I have a village 200 blocks in the sky on clear glass.  Village in cave lags just as bad as village in sky. Nether portal lags badly as well.

Solution: I don't know how to video. Sorry.

Thank you for your help.