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45f7baac5c
Every frame the render loop spawned and destroyed OS threads via std::async: the M2 doodad animation update, three secondary command buffer recording tasks, up to N bone-matrix chunks in the M2 and character renderers, and two collision floor queries while moving — hundreds of thread create/destroy cycles per second. Route all of them through a shared persistent core::ThreadPool sized to the machine. Bone-matrix chunk dispatch now runs its last chunk on the calling thread so the nested case (M2 update running on a pool worker while submitting sub-work) always makes progress and cannot deadlock.