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connectionEntry.send() is on the hot path: called once per connection per broadcast tick. time.After allocates a timer that sits in the runtime timer heap until it fires (50 ms), even when the channel send succeeds immediately. At 1000 connected nodes, every tick leaks 1000 timers into the heap, creating continuous GC pressure. Replace with time.NewTimer + defer timer.Stop() so the timer is removed from the heap as soon as the fast-path send completes.