From 969cd43be19a989f1bb704a84aae94bd2dfc86c0 Mon Sep 17 00:00:00 2001
From: CWO333 <github@cwo333.com>
Date: Fri, 21 Aug 2026 22:28:38 -0500
Subject: [PATCH] Fix error code 87 when setting affinity. Add logging to Limit
 CPU Cores.

---
 Celeste_Launcher_Gui/Services/GameService.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Celeste_Launcher_Gui/Services/GameService.cs b/Celeste_Launcher_Gui/Services/GameService.cs
index 55c39d0..4816fcb 100644
--- a/Celeste_Launcher_Gui/Services/GameService.cs
+++ b/Celeste_Launcher_Gui/Services/GameService.cs
@@ -329,8 +329,16 @@ public static async Task StartGame(bool isOffline = false)
                 
                 if (LegacyBootstrapper.UserConfig.LimitCPUCores)
                 {
+                    Logger.Information("Limit CPU Cores enabled.");
                     gameProcess.PriorityClass = ProcessPriorityClass.High;
-                    gameProcess.ProcessorAffinity = (IntPtr) 0xF;
+                    Logger.Information("Logical Processors Available: {@Processors}", Environment.ProcessorCount.ToString());
+                    if (Environment.ProcessorCount > 4)
+                    {
+                        gameProcess.ProcessorAffinity = (IntPtr) 0xF;
+                        Logger.Information("Processor Affinity set to: {@Affinity}", gameProcess.ProcessorAffinity);
+                    }
+                    else
+                        Logger.Information("Limit CPU Cores ignored. Not enough cores available to enable.");
                 }
             }
             catch (Exception exception)