diff --git a/src/Features/ScreenSpaceGI.cpp b/src/Features/ScreenSpaceGI.cpp
index 458beccb23..09f8156dba 100644
--- a/src/Features/ScreenSpaceGI.cpp
+++ b/src/Features/ScreenSpaceGI.cpp
@@ -403,7 +403,7 @@ void ScreenSpaceGI::SetupResources()
 		{
 			texRadiance = eastl::make_unique<Texture2D>(texDesc);
 			texRadiance->CreateSRV(srvDesc);
-			texRadiance->CreateUAV(uavDesc);  // Create default UAV for mip 0
+			// No default UAV needed: prefilterRadiance binds per-mip UAVs via uavRadiance[].
 
 			// Create individual UAVs for each mip level for prefiltering
 			for (uint i = 0; i < 5; ++i) {
@@ -415,10 +415,12 @@ void ScreenSpaceGI::SetupResources()
 				DX::ThrowIfFailed(device->CreateUnorderedAccessView(texRadiance->resource.get(), &mipUavDesc, uavRadiance[i].put()));
 			}
 
-			// Create temporary texture for prefiltering (single mip level, used as SRV input)
+			// Staging texture for mip 0 radiance. radianceDisocc writes it directly,
+			// prefilterRadiance reads it as SRV and writes the mip chain back to texRadiance.
+			// Avoids a full-texture CopySubresourceRegion each frame.
 			D3D11_TEXTURE2D_DESC tempTexDesc = texDesc;
 			tempTexDesc.MipLevels = 1;
-			tempTexDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET;
+			tempTexDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_UNORDERED_ACCESS;
 
 			D3D11_SHADER_RESOURCE_VIEW_DESC tempSrvDesc = {
 				.Format = DXGI_FORMAT_R11G11B10_FLOAT,
@@ -428,8 +430,15 @@ void ScreenSpaceGI::SetupResources()
 					.MipLevels = 1 }
 			};
 
+			D3D11_UNORDERED_ACCESS_VIEW_DESC tempUavDesc = {
+				.Format = DXGI_FORMAT_R11G11B10_FLOAT,
+				.ViewDimension = D3D11_UAV_DIMENSION_TEXTURE2D,
+				.Texture2D = { .MipSlice = 0 }
+			};
+
 			texRadianceTemp = eastl::make_unique<Texture2D>(tempTexDesc);
 			texRadianceTemp->CreateSRV(tempSrvDesc);
+			texRadianceTemp->CreateUAV(tempUavDesc);
 		}
 
 		texDesc.BindFlags &= ~D3D11_BIND_RENDER_TARGET;
@@ -774,7 +783,7 @@ void ScreenSpaceGI::DrawSSGI()
 		srvs.at(9) = texGiSpecular[inputAoTexIdx]->srv.get();
 		srvs.at(10) = nullptr;
 
-		uavs.at(0) = texRadiance->uav.get();
+		uavs.at(0) = texRadianceTemp->uav.get();
 		uavs.at(1) = texAccumFrames[!lastFrameAccumTexIdx]->uav.get();
 		uavs.at(2) = texAo[!inputAoTexIdx]->uav.get();
 		uavs.at(3) = texIlY[!inputGITexIdx]->uav.get();
@@ -786,22 +795,19 @@ void ScreenSpaceGI::DrawSSGI()
 		context->CSSetShader(radianceDisoccCompute.get(), nullptr, 0);
 		context->Dispatch((internalRes[0] + 7u) >> 3, (internalRes[1] + 7u) >> 3, 1);
 
-		// Prefilter radiance texture instead of using GenerateMips for proper dynamic resolution handling
+		// Prefilter radiance texture instead of using GenerateMips for proper dynamic resolution handling.
+		// radianceDisocc wrote mip 0 directly to texRadianceTemp above, so we can bind it
+		// as SRV input here without an intermediate CopySubresourceRegion.
 		{
 			TracyD3D11Zone(globals::state->tracyCtx, "SSGI - Prefilter Radiance");
 
-			// First copy mip 0 from radiance to temporary texture to avoid read/write conflict
-			context->CopySubresourceRegion(
-				texRadianceTemp->resource.get(), 0, 0, 0, 0,
-				texRadiance->resource.get(), 0, nullptr);
-
 			resetViews();
-			srvs.at(0) = texRadianceTemp->srv.get();  // Use temporary texture as input
-			uavs.at(0) = uavRadiance[0].get();        // Mip 0
-			uavs.at(1) = uavRadiance[1].get();        // Mip 1
-			uavs.at(2) = uavRadiance[2].get();        // Mip 2
-			uavs.at(3) = uavRadiance[3].get();        // Mip 3
-			uavs.at(4) = uavRadiance[4].get();        // Mip 4
+			srvs.at(0) = texRadianceTemp->srv.get();
+			uavs.at(0) = uavRadiance[0].get();  // Mip 0
+			uavs.at(1) = uavRadiance[1].get();  // Mip 1
+			uavs.at(2) = uavRadiance[2].get();  // Mip 2
+			uavs.at(3) = uavRadiance[3].get();  // Mip 3
+			uavs.at(4) = uavRadiance[4].get();  // Mip 4
 
 			context->CSSetShaderResources(0, 1, srvs.data());
 			context->CSSetUnorderedAccessViews(0, 5, uavs.data(), nullptr);