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We use a xamarin forms(2.3.4) listview with grouping header, uneven row size. Listview keeps flickering when scrolled or updated both on desktop and mobile platforms. Used caching strategy and every possible optimization. But it still happens.
Are you referring to the black background on cells when scrolling? Have you tested performance with 2.4? The black boxes are normal and can occur even in non Forms apps.
Due to a lack of response we are closing this issue. This is also an issue that will sometimes occur on non-Forms UWP applications.