diff --git a/indra/newview/llaisapi.cpp b/indra/newview/llaisapi.cpp
index a1191e8a31..a5dca715cb 100644
--- a/indra/newview/llaisapi.cpp
+++ b/indra/newview/llaisapi.cpp
@@ -1044,6 +1044,13 @@ void AISAPI::InvokeAISCommandCoro(LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t ht
 U32 AISUpdate::sBatchFrameCount = 0;
 LLTimer AISUpdate::sBatchTimer;
 
+// Coalesces the deferred gInventory::notifyObservers() calls issued below
+// when the change backlog exceeds MAX_UPDATE_BACKLOG, so repeated iterations
+// while the backlog remains large don't flood gMainloopWork with duplicate
+// postToMainCoro callbacks. Cleared once the posted callback actually runs
+// notifyObservers().
+static bool sAISNotifyObserversPending = false;
+
 AISUpdate::AISUpdate(const LLSD& update, AISAPI::COMMAND_TYPE type, const LLSD& request_body)
 : mType(type)
 {
@@ -1683,7 +1690,16 @@ void AISUpdate::doUpdate()
         // fetching can receive massive amount of items and folders
         if (gInventory.getChangedIDs().size() > MAX_UPDATE_BACKLOG)
         {
-            gInventory.notifyObservers();
+            if (!sAISNotifyObserversPending)
+            {
+                sAISNotifyObserversPending = true;
+                LLAppViewer::instance()->postToMainCoro(
+                    []()
+                    {
+                        gInventory.notifyObservers();
+                        sAISNotifyObserversPending = false;
+                    });
+            }
             checkTimeout();
         }
     }
@@ -1744,7 +1760,16 @@ void AISUpdate::doUpdate()
         // fetching can receive massive amount of items and folders
         if (gInventory.getChangedIDs().size() > MAX_UPDATE_BACKLOG)
         {
-            gInventory.notifyObservers();
+            if (!sAISNotifyObserversPending)
+            {
+                sAISNotifyObserversPending = true;
+                LLAppViewer::instance()->postToMainCoro(
+                    []()
+                    {
+                        gInventory.notifyObservers();
+                        sAISNotifyObserversPending = false;
+                    });
+            }
             checkTimeout();
         }
     }
@@ -1815,6 +1840,9 @@ void AISUpdate::doUpdate()
 
     checkTimeout();
 
-    gInventory.notifyObservers();
+    LLAppViewer::instance()->postToMainCoro(
+        []()
+        {
+            gInventory.notifyObservers();
+        });
 }
-