diff --git a/threading_performance_report.md b/threading_performance_report.md
index 1d45663..407f2be 100644
--- a/threading_performance_report.md
+++ b/threading_performance_report.md
@@ -43,6 +43,8 @@ WeaselDB achieved 1.3M requests/second throughput using a two-stage ThreadPipeli
 
 **Stage-0 Batch Size Optimization**:
 - **Changed**: Stage-0 max batch size from unlimited to 1
+- **Mechanism**: Single-item processing checks for work more frequently, keeping the thread in fast coordination paths instead of expensive spin/wait cycles
+- **Profile evidence**: Coordination overhead reduced from ~11% to ~5.6% CPU time
 - **Result**: Additional 12.7% increase in serial CPU budget (488ns → 550ns)
 - **Overall improvement**: 38.9% increase from baseline (396ns → 550ns)