From 81a656930aeb2b2977ae986fb03feb81260791c6 Mon Sep 17 00:00:00 2001
From: Keith Williams <keithwillcode@gmail.com>
Date: Thu, 29 Jan 2026 19:30:48 -0300
Subject: [PATCH] perf: increase Office365 calendarView page size to 999 to
 minimize pagination (#27407)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 packages/app-store/office365calendar/lib/CalendarService.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/app-store/office365calendar/lib/CalendarService.ts b/packages/app-store/office365calendar/lib/CalendarService.ts
index 47cf42a885..38db840316 100644
--- a/packages/app-store/office365calendar/lib/CalendarService.ts
+++ b/packages/app-store/office365calendar/lib/CalendarService.ts
@@ -369,7 +369,9 @@ class Office365CalendarService implements Calendar {
       dateFromParsed.toISOString()
     )}&endDateTime=${encodeURIComponent(dateToParsed.toISOString())}`;
 
-    const calendarSelectParams = "$select=showAs,start,end";
+    // Request maximum page size (999) to minimize pagination rounds
+    // Microsoft Graph allows up to 999 items per page for calendarView
+    const calendarSelectParams = "$select=showAs,start,end&$top=999";
 
     try {
       const selectedCalendarIds = selectedCalendars.reduce((calendarIds, calendar) => {