When I broke a block in Survival it would dissapear then reapear then disapear and then give me the item. But it would lag my computer like crazy when that happend.(by 'when' I mean whenever I break a block)

Whenever I broke a block in Survival it would dissapear then reapear then disapear and then give me the item. But it would lag my computer like crazy when that happend.(by 'when' I mean whenever I break a block)