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Aleksander Grygier
e38e511c51
Every message row mounted its full component tree on load, so the cycle collector, GC and layout invalidation kept walking every live object and DOM node even for rows the user never scrolls to - which dominated the profile of long conversations. Wrap each row in a placeholder with an IntersectionObserver ( two viewport heights of runway ) that swaps in the real ChatMessage when the row approaches the viewport; the row shell keeps the content-visibility sizing, and rows stay mounted once realized. Rows targeted by the pending-edit flow mount eagerly. Assisted-by: pi:zai-org/GLM-5.3