In my survival world interacting with items in your inventoyru and in a crafting table briefly signifiganly reduces frames. I usually have 2-3 shulker boxes in my inventory and the effect was seemed much worse when I had a sholker box iny inventory full of buckets of tropical fish.
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Duplicate of MCPE-27167 and for the fish, MCPE-35314.
Didn't see this issue until the most recent updates. I believe that I've seen this same issue. My framerate lags SIGNIFICANTLY, to the point of not being able to move items without pressing buttons a few times before the command actually happens. I didn't have the issue until I had gone to the end and started using shulker boxes, if I remember correctly. They may have something to do with it. But I believe I've seen it happen without one in my inventory as well. If I'm interacting with a chest or with anything crafting, I don't notice it, but if I open my personal inventory my FPS drops to what seems to be around 10 or so. Really makes it difficult.