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J. Nick Koston
d4d8e92243
The set_timeout lambda captured [this, curr_time_ns] (4 + 8 = 12 bytes), exceeding the std::function small buffer optimization threshold (8 bytes on 32-bit) and forcing a heap allocation every measurement cycle (every 3s in LP mode). Store curr_time_ns as a class member and capture only [this] (4 bytes), which fits inline in the SBO. Trades 8 bytes of permanent member storage to eliminate a heap alloc+free cycle per measurement.
