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- Replace MSG_PEEK-based protocol detection with inline detection in handleRecv, fixing 20x slowdown on arm64 where MSG_PEEK behaves differently. Detection now happens on first received data, matching epoll's approach. - Remove dead code: prepRecvPeek, udPeek, msgPeek, handlePeek. - Eliminate per-DATA-frame map allocation in FlushWindowUpdates by writing WINDOW_UPDATE frames directly while iterating pending updates. - Lower windowUpdateThreshold from 16384 to 1024 so small bodies (4KB) get timely flow control credits on multiplexed connections. - Clean up pendingStreamUpdates in DeleteStream to prevent unbounded map growth over long-lived connections.
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