diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5144e7a8..4800e3e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Patch Changes
 
+- Operation Lightspeed: 5 parallel performance optimizations — multi-layer backpressure to prevent terminal write freezes, TERMINAL_TAIL_SIZE constant with client-drop recovery, tab switching SSE gating, and local echo improvements
 - Codebase cleanup: remove dead code (unused token validation exports, PlanPhase alias), add execPattern() regex helper to eliminate repetitive .lastIndex resets, centralize 11 magic number constants into config files, fix CLAUDE.md inaccuracies, and add 316 new tests for utilities, respawn helpers, and system-routes
 
 ## 0.3.6