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I replaced my iphone 6 plus display last night and now typing on the keyboard is much slower, it isn’t recognizing key strokes as fast as it did with the original display and we have to type “harder”. Is this a “learning” thing, or did I not put a cable in tight enough or, …

Faulty screen, basically all are refurbished and some use thicker glass or OCA which is slightly resistant, so touch isn’t as responsive. Return it and order another somewhere else. Look for established companies who refurbish screens using original glass, bezel, good quality OCA and original backlight.