ios - UITableViewCell scrolling is janky when the scrolling is slow / decellarating -

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i have problem have relatively sophisticated table view cell using autolayout, , can't seem understand why scrolling jerky @ slow speed.

i have run through instruments time profiler nothing stands out major cause. additionally, when scroll quickly, goes smoothly on iphone 6s. have verified can 55 - 60 fps using instruments core animation. issue happens when scroll little bit.

here facts think relevant:

  1. the table view using automatic dimension using estimated row height.
  2. cells being reused.
  3. the table view has 20+ sections, , each section have 3 rows.
  4. each cell has collection view displays photos in grid format. height of collection view changes based on how many photos show in grid using height constraint.
  5. i tried eradicate blended layers, doesn't fix issue seeing.
  6. even tried simple solution of caching cell height in willdisplaycell delegate method , see if scrolling upwards smoother. didn't work.

i happy provide more data points, stuck in way don't know else try or for.

any appreciated.

hope can find answer in bottom of page in below link

what uitableview separatoreffect property for?


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