From 89b5bc276f04e3cca2ed5dc153b1113e629ca342 Mon Sep 17 00:00:00 2001
From: _Kerman <kermanx@qq.com>
Date: Fri, 21 Aug 2026 14:09:39 +0800
Subject: [PATCH] perf(session-projection): skip history reads for in-order
 events

---
 packages/session/session-projection/src/index.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/session/session-projection/src/index.ts b/packages/session/session-projection/src/index.ts
index 6126e88810..6029947c68 100644
--- a/packages/session/session-projection/src/index.ts
+++ b/packages/session/session-projection/src/index.ts
@@ -529,8 +529,10 @@ export class SessionProjectionRegistry extends Service {
         registration.cells.set(session, cell)
       }
       if (cell.observedSeq >= event.seq) continue
-      for (const prior of session.events.slice(cell.observedSeq + 1, event.seq)) {
-        this.applyToCell(registration, session, cell, prior)
+      if (cell.observedSeq + 1 < event.seq) {
+        for (const prior of session.events.slice(cell.observedSeq + 1, event.seq)) {
+          this.applyToCell(registration, session, cell, prior)
+        }
       }
       this.applyToCell(registration, session, cell, event)
     }