From 48258b1e50ec995c77cf773ed84cf165f775398e Mon Sep 17 00:00:00 2001
From: ParantezTech <12572227+par274@users.noreply.github.com>
Date: Sun, 11 Oct 2026 01:39:56 +0300
Subject: [PATCH] [Core] Map guest thread priorities one band lower

---
 src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.cs b/src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.cs
index c807f76..442a67b 100644
--- a/src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.cs
+++ b/src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.cs
@@ -5757,18 +5757,21 @@ public sealed unsafe partial class DirectExecutionBackend : INativeCpuBackend, I
 		return true;
 	}
 
+	private static readonly bool LegacyGuestPriorities =
+		string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_GUEST_PRIORITY"), "legacy", StringComparison.OrdinalIgnoreCase);
+
 	private static ThreadPriority MapGuestThreadPriority(int priority)
 	{
 		if (priority <= 478)
 		{
-			return ThreadPriority.Highest;
+			return LegacyGuestPriorities ? ThreadPriority.Highest : ThreadPriority.Normal;
 		}
 		if (priority >= 733)
 		{
 			return ThreadPriority.Lowest;
 		}
 
-		return ThreadPriority.Normal;
+		return LegacyGuestPriorities ? ThreadPriority.Normal : ThreadPriority.BelowNormal;
 	}
 
 	private void ApplyGuestThreadAffinity(ulong guestAffinityMask)