Lag in the certain area

There's so much lag in my survival main base, but when i go to outside base it doesn't lagging anymore, and then i tried blew up everything to find the cause of the lag, but still there's so much lag in that area or even chunk in my base, it is really confusing me. If something like entity or some redstone contraption is the cause, then why when i blew up everything and there's nothing left anymore and still lagging?