The 'flowerbed_#' block models used by the pink petals have several block faces that can never be seen by the player, potentially causing frame drops.
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ampolive
For me, the performance gain was much less noticeable, bit it was still a difference of around 5-10 FPS (tested it on a grass platform on a Cherry Grove single biome world, but there were less pink petals).
muzikbike
Fry