From 6f4ced5ed62efd3a02b21ff6086385ed99a998c9 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Thu, 5 Feb 2026 23:13:53 -0600
Subject: [PATCH] Assume GPUs on non-x86 platforms are slow by default

This can be overriden with GL_IS_SLOW=0 at runtime
for systems with a fast GPU, though it doesn't make
much difference either way for non-KMSDRM cases.

For slower GPUs, this enables important scaling and
rendering optimizations that can substantially
improve performance (especially on fillrate-limited
GPUs common in SBCs).
---
 app/streaming/video/ffmpeg.cpp | 8 ++++----
 app/wm.cpp                     | 3 ++-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/app/streaming/video/ffmpeg.cpp b/app/streaming/video/ffmpeg.cpp
index 4e4f843b..d66de359 100644
--- a/app/streaming/video/ffmpeg.cpp
+++ b/app/streaming/video/ffmpeg.cpp
@@ -344,7 +344,7 @@ bool FFmpegVideoDecoder::createFrontendRenderer(PDECODER_PARAMETERS params, bool
 #ifdef GL_IS_SLOW
         glIsSlow = true;
 #else
-        glIsSlow = false;
+        glIsSlow = WMUtils::isGpuSlow();
 #endif
     }
 
@@ -352,7 +352,7 @@ bool FFmpegVideoDecoder::createFrontendRenderer(PDECODER_PARAMETERS params, bool
 #ifdef VULKAN_IS_SLOW
         vulkanIsSlow = true;
 #else
-        vulkanIsSlow = false;
+        vulkanIsSlow = WMUtils::isGpuSlow();
 #endif
     }
 
@@ -1298,7 +1298,7 @@ bool FFmpegVideoDecoder::tryInitializeRendererForUnknownDecoder(const AVCodec* d
 #ifdef GL_IS_SLOW
         glIsSlow = true;
 #else
-        glIsSlow = false;
+        glIsSlow = WMUtils::isGpuSlow();
 #endif
     }
 
@@ -1306,7 +1306,7 @@ bool FFmpegVideoDecoder::tryInitializeRendererForUnknownDecoder(const AVCodec* d
 #ifdef VULKAN_IS_SLOW
         vulkanIsSlow = true;
 #else
-        vulkanIsSlow = false;
+        vulkanIsSlow = WMUtils::isGpuSlow();
 #endif
     }
 
diff --git a/app/wm.cpp b/app/wm.cpp
index 4a47dc86..09cf6df6 100644
--- a/app/wm.cpp
+++ b/app/wm.cpp
@@ -210,7 +210,8 @@ bool WMUtils::isGpuSlow()
     bool ret;
 
     if (!Utils::getEnvironmentVariableOverride("GL_IS_SLOW", &ret)) {
-#ifdef GL_IS_SLOW
+#if defined(GL_IS_SLOW) || !defined(Q_PROCESSOR_X86)
+        // We currently assume GPUs on non-x86 hardware are slow by default
         ret = true;
 #else
         ret = false;