When there is a lot of things you can craft in the quick craft menu and you hover over a item in the quick craft menu, the games frame rate gets super low and it's really laggy, but as soon as your not hovering over any items in the quick craft menu or if you just close it, the frame rate goes back to normal.
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We're tracking this issue in MCPE-162277, so this ticket is being resolved and linked as a duplicate.
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