diff --git a/src/pages/inbox/AccountManagerBanner.tsx b/src/pages/inbox/AccountManagerBanner.tsx
index aca7344274ee..7e54ba010b42 100644
--- a/src/pages/inbox/AccountManagerBanner.tsx
+++ b/src/pages/inbox/AccountManagerBanner.tsx
@@ -6,7 +6,6 @@ import useOnyx from '@hooks/useOnyx';
 import useThemeStyles from '@hooks/useThemeStyles';
 import getNonEmptyStringOnyxID from '@libs/getNonEmptyStringOnyxID';
 import Navigation from '@libs/Navigation/Navigation';
-import {getPersonalDetailsForAccountIDs} from '@libs/OptionsListUtils';
 import {getDisplayNameOrDefault} from '@libs/PersonalDetailsUtils';
 import {getParticipantsAccountIDsForDisplay, isConciergeChatReport} from '@libs/ReportUtils';
 import ONYXKEYS from '@src/ONYXKEYS';
@@ -23,16 +22,15 @@ function AccountManagerBanner({reportID}: AccountManagerBannerProps) {
     const [report] = useOnyx(`${ONYXKEYS.COLLECTION.REPORT}${getNonEmptyStringOnyxID(reportID)}`);
     const [accountManagerReportID] = useOnyx(ONYXKEYS.ACCOUNT_MANAGER_REPORT_ID);
     const [accountManagerReport] = useOnyx(`${ONYXKEYS.COLLECTION.REPORT}${getNonEmptyStringOnyxID(accountManagerReportID)}`);
-    const [personalDetails] = useOnyx(ONYXKEYS.PERSONAL_DETAILS_LIST);
+    const accountManagerAccountID = getParticipantsAccountIDsForDisplay(accountManagerReport, false, true)?.at(0) ?? -1;
+    const [participantPersonalDetail] = useOnyx(ONYXKEYS.PERSONAL_DETAILS_LIST, {
+        selector: (details) => details?.[accountManagerAccountID],
+    });
     const [isBannerVisible, setIsBannerVisible] = useState(true);
 
     if (!accountManagerReportID || !isConciergeChatReport(report) || !isBannerVisible) {
         return null;
     }
-
-    const participants = getParticipantsAccountIDsForDisplay(accountManagerReport, false, true);
-    const participantPersonalDetails = getPersonalDetailsForAccountIDs([participants?.at(0) ?? -1], personalDetails);
-    const participantPersonalDetail = Object.values(participantPersonalDetails).at(0);
     const displayName = getDisplayNameOrDefault(participantPersonalDetail);
     const login = participantPersonalDetail?.login;
     const chatWithAccountManagerText = displayName && login ? translate('common.chatWithAccountManager', `${displayName} (${login})`) : '';
diff --git a/src/pages/inbox/ReportNotFoundGuard.tsx b/src/pages/inbox/ReportNotFoundGuard.tsx
index c5ce99b3becf..861a421fb93b 100644
--- a/src/pages/inbox/ReportNotFoundGuard.tsx
+++ b/src/pages/inbox/ReportNotFoundGuard.tsx
@@ -1,6 +1,7 @@
 import {useRoute} from '@react-navigation/native';
 import type {ReactNode} from 'react';
 import React, {useEffect} from 'react';
+import type {OnyxEntry} from 'react-native-onyx';
 import FullPageNotFoundView from '@components/BlockingViews/FullPageNotFoundView';
 import useNetwork from '@hooks/useNetwork';
 import useOnyx from '@hooks/useOnyx';
@@ -15,23 +16,31 @@ import {getParentReportActionDeletionStatus} from '@libs/TransactionNavigationUt
 import CONST from '@src/CONST';
 import ONYXKEYS from '@src/ONYXKEYS';
 import {isLoadingInitialReportActionsSelector} from '@src/selectors/ReportMetaData';
+import type * as OnyxTypes from '@src/types/onyx';
 
 type ReportNotFoundGuardProps = {
     children: ReactNode;
 };
 
+/**
+ * Two-level gate: the outer guard subscribes to lightweight keys to determine
+ * whether the report clearly exists. When it does (and the report is not a
+ * transaction thread), children render directly without the cost of
+ * parentReportMetadata / useParentReportAction subscriptions.
+ *
+ * The inner gate mounts only when the "not found" path is plausible:
+ * the report is missing, the path is invalid, or the report is a transaction
+ * thread whose parent action may have been deleted.
+ */
 // eslint-disable-next-line rulesdir/no-negated-variables
 function ReportNotFoundGuard({children}: ReportNotFoundGuardProps) {
-    const styles = useThemeStyles();
     const route = useRoute();
     const routeParams = route.params as {reportID?: string} | undefined;
     const reportIDFromRoute = getNonEmptyStringOnyxID(routeParams?.reportID);
 
     const {isOffline} = useNetwork();
-    const {shouldUseNarrowLayout} = useResponsiveLayout();
 
     const [report] = useOnyx(`${ONYXKEYS.COLLECTION.REPORT}${reportIDFromRoute}`);
-    const [parentReportMetadata] = useOnyx(`${ONYXKEYS.COLLECTION.REPORT_METADATA}${report?.parentReportID}`);
     const [userLeavingStatus = false] = useOnyx(`${ONYXKEYS.COLLECTION.REPORT_USER_IS_LEAVING_ROOM}${reportIDFromRoute}`);
     const [isLoadingInitialReportActions = true] = useOnyx(`${ONYXKEYS.COLLECTION.REPORT_METADATA}${reportIDFromRoute}`, {
         selector: isLoadingInitialReportActionsSelector,
@@ -40,9 +49,81 @@ function ReportNotFoundGuard({children}: ReportNotFoundGuardProps) {
     const [isLoadingApp] = useOnyx(ONYXKEYS.IS_LOADING_APP);
     const [deleteTransactionNavigateBackUrl] = useOnyx(ONYXKEYS.NVP_DELETE_TRANSACTION_NAVIGATE_BACK_URL);
 
-    const parentReportAction = useParentReportAction(report);
     const reportID = report?.reportID;
     const isOptimisticDelete = report?.statusNum === CONST.REPORT.STATUS_NUM.CLOSED;
+    const isInvalidReportPath = !!routeParams?.reportID && !isValidReportIDFromPath(routeParams.reportID);
+    const isLoading = isLoadingApp !== false || isLoadingReportData || (!isOffline && !!isLoadingInitialReportActions);
+    const mayBeTransactionThread = isReportTransactionThread(report);
+
+    // Fast path: skip the expensive inner guard (parentReportMetadata, useParentReportAction)
+    // when we can determine shouldShowNotFoundPage is definitely false.
+    //
+    // shouldShowNotFoundPage is false when:
+    //  - deleteTransactionNavigateBackUrl is set (always suppresses not-found), OR
+    //  - path is valid AND report is not a transaction thread AND (still loading OR report exists)
+    const reportClearlyExists = !!reportID || isOptimisticDelete || userLeavingStatus;
+    const canSkipInnerGuard = !!deleteTransactionNavigateBackUrl || (!isInvalidReportPath && !mayBeTransactionThread && (isLoading || reportClearlyExists));
+    if (canSkipInnerGuard) {
+        return children;
+    }
+
+    return (
+        <ReportNotFoundInnerGuard
+            report={report}
+            reportIDFromPath={routeParams?.reportID}
+            reportID={reportID}
+            isOptimisticDelete={isOptimisticDelete}
+            isInvalidReportPath={isInvalidReportPath}
+            isLoading={isLoading}
+            isLoadingApp={isLoadingApp}
+            isLoadingReportData={isLoadingReportData}
+            isLoadingInitialReportActions={isLoadingInitialReportActions}
+            isOffline={isOffline}
+            userLeavingStatus={userLeavingStatus}
+            deleteTransactionNavigateBackUrl={deleteTransactionNavigateBackUrl}
+        >
+            {children}
+        </ReportNotFoundInnerGuard>
+    );
+}
+
+type ReportNotFoundInnerGuardProps = {
+    report: OnyxEntry<OnyxTypes.Report>;
+    reportIDFromPath: string | undefined;
+    reportID: string | undefined;
+    isOptimisticDelete: boolean;
+    isInvalidReportPath: boolean;
+    isLoading: boolean;
+    isLoadingApp: OnyxEntry<boolean>;
+    isLoadingReportData: boolean;
+    isLoadingInitialReportActions: boolean;
+    isOffline: boolean;
+    userLeavingStatus: boolean;
+    deleteTransactionNavigateBackUrl: OnyxEntry<string>;
+    children: ReactNode;
+};
+
+// eslint-disable-next-line rulesdir/no-negated-variables
+function ReportNotFoundInnerGuard({
+    report,
+    reportIDFromPath,
+    reportID,
+    isOptimisticDelete,
+    isInvalidReportPath,
+    isLoading,
+    isLoadingApp,
+    isLoadingReportData,
+    isLoadingInitialReportActions,
+    isOffline,
+    userLeavingStatus,
+    deleteTransactionNavigateBackUrl,
+    children,
+}: ReportNotFoundInnerGuardProps) {
+    const styles = useThemeStyles();
+    const {shouldUseNarrowLayout} = useResponsiveLayout();
+
+    const [parentReportMetadata] = useOnyx(`${ONYXKEYS.COLLECTION.REPORT_METADATA}${report?.parentReportID}`);
+    const parentReportAction = useParentReportAction(report);
 
     const {isParentActionMissingAfterLoad, isParentActionDeleted} = getParentReportActionDeletionStatus({
         parentReportID: report?.parentReportID,
@@ -53,8 +134,6 @@ function ReportNotFoundGuard({children}: ReportNotFoundGuardProps) {
     });
     const isDeletedTransactionThread = isReportTransactionThread(report) && (isParentActionDeleted || isParentActionMissingAfterLoad);
 
-    const isInvalidReportPath = !!routeParams?.reportID && !isValidReportIDFromPath(routeParams.reportID);
-    const isLoading = isLoadingApp !== false || isLoadingReportData || (!isOffline && !!isLoadingInitialReportActions);
     const reportExists = !!reportID || (!isDeletedTransactionThread && isOptimisticDelete) || userLeavingStatus;
 
     // eslint-disable-next-line rulesdir/no-negated-variables
@@ -73,7 +152,7 @@ function ReportNotFoundGuard({children}: ReportNotFoundGuardProps) {
             reportID,
             isOptimisticDelete,
             userLeavingStatus,
-            reportIDFromPath: routeParams?.reportID,
+            reportIDFromPath,
             deleteTransactionNavigateBackUrl,
             isDeletedTransactionThread,
             isParentActionDeleted,
@@ -88,7 +167,7 @@ function ReportNotFoundGuard({children}: ReportNotFoundGuardProps) {
         reportID,
         isOptimisticDelete,
         userLeavingStatus,
-        routeParams?.reportID,
+        reportIDFromPath,
         deleteTransactionNavigateBackUrl,
         isDeletedTransactionThread,
         isParentActionDeleted,