diff --git a/internal/graphicscommand/bench_test.go b/internal/graphicscommand/bench_test.go
new file mode 100644
index 000000000..03a7cf0a1
--- /dev/null
+++ b/internal/graphicscommand/bench_test.go
@@ -0,0 +1,34 @@
+// Copyright 2024 The Ebitengine Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package graphicscommand_test
+
+import (
+	"image"
+	"testing"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
+	"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
+)
+
+func BenchmarkPrependPreservedUniforms(b *testing.B) {
+	var uniforms [graphics.PreservedUniformUint32Count]uint32
+	dst := graphicscommand.NewImage(16, 16, false, "")
+	src := graphicscommand.NewImage(16, 16, false, "")
+	dr := image.Rect(0, 0, 16, 16)
+	sr := image.Rect(0, 0, 16, 16)
+	for i := 0; i < b.N; i++ {
+		graphicscommand.PrependPreservedUniforms(uniforms[:], nearestFilterShader, dst, [graphics.ShaderSrcImageCount]*graphicscommand.Image{src}, dr, [graphics.ShaderSrcImageCount]image.Rectangle{sr})
+	}
+}
diff --git a/internal/graphicscommand/commandqueue.go b/internal/graphicscommand/commandqueue.go
index 388a18563..519b25b12 100644
--- a/internal/graphicscommand/commandqueue.go
+++ b/internal/graphicscommand/commandqueue.go
@@ -349,7 +349,10 @@ func (q *commandQueue) prependPreservedUniforms(uniforms []uint32, shader *Shade
 	origUniforms := uniforms
 	uniforms = q.uint32sBuffer.alloc(len(origUniforms) + graphics.PreservedUniformUint32Count)
 	copy(uniforms[graphics.PreservedUniformUint32Count:], origUniforms)
+	return prependPreservedUniforms(uniforms, shader, dst, srcs, dstRegion, srcRegions)
+}
 
+func prependPreservedUniforms(uniforms []uint32, shader *Shader, dst *Image, srcs [graphics.ShaderSrcImageCount]*Image, dstRegion image.Rectangle, srcRegions [graphics.ShaderSrcImageCount]image.Rectangle) []uint32 {
 	// Set the destination texture size.
 	dw, dh := dst.InternalSize()
 	uniforms[0] = math.Float32bits(float32(dw))
diff --git a/internal/graphicscommand/export_test.go b/internal/graphicscommand/export_test.go
index 016c4569f..a17cd7dfb 100644
--- a/internal/graphicscommand/export_test.go
+++ b/internal/graphicscommand/export_test.go
@@ -14,8 +14,18 @@
 
 package graphicscommand
 
+import (
+	"image"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
+)
+
 type WritePixelsCommandArgs = writePixelsCommandArgs
 
 func (i *Image) BufferedWritePixelsArgsForTesting() []WritePixelsCommandArgs {
 	return i.bufferedWritePixelsArgs
 }
+
+func PrependPreservedUniforms(uniforms []uint32, shader *Shader, dst *Image, srcs [graphics.ShaderSrcImageCount]*Image, dstRegion image.Rectangle, srcRegions [graphics.ShaderSrcImageCount]image.Rectangle) []uint32 {
+	return prependPreservedUniforms(uniforms, shader, dst, srcs, dstRegion, srcRegions)
+}