Update: fuzzy version of pool with CircularBuffer Fastest so far, but has a tendency to spill/allocate in during very high contention AllocDeallocST - Avg: 0.63ms, Created: 0 Spilled: 0 AllocDeallocMTShortLived - Avg: 2.79ms, Created: 144(0.45%) Spilled: 169(0.53%) AllocDeallocMTLongLived - Avg: 2.94ms, Created: 0 Spilled: 0 AllocDeallocMPSC - Avg: 3.26ms, Created: 0 Spilled: 0 Tests: ran unit and perf tests