diff --git a/.github/workflows/benchmark-comparison.yaml b/.github/workflows/benchmark-comparison.yaml
new file mode 100644
index 0000000..1f172f3
--- /dev/null
+++ b/.github/workflows/benchmark-comparison.yaml
@@ -0,0 +1,202 @@
+name: benchmark-comparison
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+
+  compare:
+    strategy:
+      matrix:
+        runner:
+          - ubuntu-latest
+          - ubuntu-slim
+    runs-on: ${{ matrix.runner }}
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
+        id: setup-go
+        with:
+          go-version: 1.27.x
+          check-latest: true
+
+      - name: Comparison
+        run: |
+          run_benchmark() {
+            local version="$1"
+            local package="$2"
+
+            pushd "_benchmark/comparison/$version"
+
+            {
+              echo '$' go get "$package@latest"
+              go get "$package@latest" 2>&1
+              echo
+              go test -bench . -benchmem -run '^$' -count 10
+            } | tee benchmark.out
+
+            {
+              echo "## $version (${{ matrix.runner }})"
+              echo
+            } >> "$GITHUB_STEP_SUMMARY"
+
+            awk '
+              function comma(n, s, sign, result) {
+                sign = ""
+                if (n < 0) {
+                  sign = "-"
+                  n = -n
+                }
+
+                s = sprintf("%.0f", n)
+                result = ""
+
+                while (length(s) > 3) {
+                  result = "," substr(s, length(s) - 2, 3) result
+                  s = substr(s, 1, length(s) - 3)
+                }
+
+                return sign s result
+              }
+
+              # ns/op
+              /^Benchmark/ {
+                ++n
+                ns[n] = $3
+                bytes[n] = $5
+                allocs[n] = $7
+              }
+
+              END {
+                #
+                #   Sort ns/op
+                #
+                for (i = 1; i <= n; i++)
+                  for (j = i + 1; j <= n; j++)
+                    if (ns[i] > ns[j]) {
+                      tmp = ns[i]
+                      ns[i] = ns[j]
+                      ns[j] = tmp
+                    }
+
+                # ns/op statistics
+                ns_sum = 0
+                for (i = 1; i <= n; i++)
+                  ns_sum += ns[i]
+
+                if (n % 2)
+                  ns_median = ns[(n + 1) / 2]
+                else
+                  ns_median = (ns[n / 2] + ns[n / 2 + 1]) / 2
+
+                #
+                #   Sort B/op
+                #
+                for (i = 1; i <= n; i++)
+                  for (j = i + 1; j <= n; j++)
+                    if (bytes[i] > bytes[j]) {
+                      tmp = bytes[i]
+                      bytes[i] = bytes[j]
+                      bytes[j] = tmp
+                    }
+
+                # B/op statistics
+                bytes_sum = 0
+                for (i = 1; i <= n; i++)
+                  bytes_sum += bytes[i]
+
+                if (n % 2)
+                  bytes_median = bytes[(n + 1) / 2]
+                else
+                  bytes_median = (bytes[n / 2] + bytes[n / 2 + 1]) / 2
+
+                #
+                #   Sort allocs/op
+                #
+                for (i = 1; i <= n; i++)
+                  for (j = i + 1; j <= n; j++)
+                    if (allocs[i] > allocs[j]) {
+                      tmp = allocs[i]
+                      allocs[i] = allocs[j]
+                      allocs[j] = tmp
+                    }
+
+                # allocs/op statistics
+                allocs_sum = 0
+                for (i = 1; i <= n; i++)
+                  allocs_sum += allocs[i]
+
+                if (n % 2)
+                  allocs_median = allocs[(n + 1) / 2]
+                else
+                  allocs_median = (allocs[n / 2] + allocs[n / 2 + 1]) / 2
+
+                printf "|   | Median | Average | Min | Max |\n"
+                printf "|--:|-------:|--------:|----:|----:|\n"
+                printf "| ns/op"
+                printf " | %s", comma(ns_median)
+                printf " | %s", comma(ns_sum / n)
+                printf " | %s", comma(ns[1])
+                printf " | %s", comma(ns[n])
+                printf " |\n"
+                printf "| B/op"
+                printf " | %s", comma(bytes_median)
+                printf " | %s", comma(bytes_sum / n)
+                printf " | %s", comma(bytes[1])
+                printf " | %s", comma(bytes[n])
+                printf " |\n"
+                printf "| allocs/op"
+                printf " | %s", comma(allocs_median)
+                printf " | %s", comma(allocs_sum / n)
+                printf " | %s", comma(allocs[1])
+                printf " | %s", comma(allocs[n])
+                printf " |\n"
+                printf "\n"
+              }
+              ' benchmark.out >> "$GITHUB_STEP_SUMMARY"
+
+            {
+              echo '<details>'
+              echo
+              echo '```text'
+              cat benchmark.out
+              echo '```'
+              echo
+              echo '</details>'
+              echo
+            } >> "$GITHUB_STEP_SUMMARY"
+
+            popd
+          }
+
+          {
+            echo "Go version: ${{ steps.setup-go.outputs.go-version }}"
+            echo
+          } >> "$GITHUB_STEP_SUMMARY"
+
+          run_benchmark v2 "github.com/yuin/goldmark/v2"
+          run_benchmark v1 "github.com/yuin/goldmark"
+
+  benchmark:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-go@v7
+        id: setup-go
+        with:
+          go-version: 1.27.x
+          check-latest: true
+
+      - name: Benchmark
+        run: |
+          cd _benchmark/go
+
+          go test -bench . -benchmem -run '^$' | tee benchmark.out
+          {
+            echo '```text'
+            cat benchmark.out
+            echo '```'
+          } >> "$GITHUB_STEP_SUMMARY"
diff --git a/_benchmark/comparison/v1/benchmark_test.go b/_benchmark/comparison/v1/benchmark_test.go
new file mode 100644
index 0000000..bfe9d2a
--- /dev/null
+++ b/_benchmark/comparison/v1/benchmark_test.go
@@ -0,0 +1,39 @@
+package benchmark
+
+import (
+	"bytes"
+	"os"
+	"testing"
+
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/renderer/html"
+)
+
+func BenchmarkGoldmarkV1(b *testing.B) {
+	markdown := goldmark.New(
+		goldmark.WithRendererOptions(html.WithXHTML(), html.WithUnsafe()),
+	)
+	doBenchmark(b, func(source []byte) ([]byte, error) {
+		var out bytes.Buffer
+		err := markdown.Convert(source, &out)
+		return out.Bytes(), err
+	})
+}
+
+func doBenchmark(b *testing.B, render func(src []byte) ([]byte, error)) {
+	b.StopTimer()
+	source, err := os.ReadFile("../../go/_data.md")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		out, err := render(source)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if len(out) < 100 {
+			b.Fatal("No result")
+		}
+	}
+}
diff --git a/_benchmark/comparison/v1/go.mod b/_benchmark/comparison/v1/go.mod
new file mode 100644
index 0000000..2138852
--- /dev/null
+++ b/_benchmark/comparison/v1/go.mod
@@ -0,0 +1,5 @@
+module benchmark-comparison-v1
+
+go 1.27
+
+require github.com/yuin/goldmark v1.8.5
diff --git a/_benchmark/comparison/v1/go.sum b/_benchmark/comparison/v1/go.sum
new file mode 100644
index 0000000..98fbe0d
--- /dev/null
+++ b/_benchmark/comparison/v1/go.sum
@@ -0,0 +1,2 @@
+github.com/yuin/goldmark v1.8.5 h1:r6N5afV5qj/5S4UTch8agZHJ8UxNCMwX7WjkkJam2NA=
+github.com/yuin/goldmark v1.8.5/go.mod h1:ip/1k0VRfGynBgxOz0yCqHrbZXhcjxyuS66Brc7iBKg=
diff --git a/_benchmark/comparison/v2/benchmark_test.go b/_benchmark/comparison/v2/benchmark_test.go
new file mode 100644
index 0000000..a56a997
--- /dev/null
+++ b/_benchmark/comparison/v2/benchmark_test.go
@@ -0,0 +1,38 @@
+package benchmark
+
+import (
+	"bytes"
+	"os"
+	"testing"
+
+	"github.com/yuin/goldmark/v2/parser"
+	"github.com/yuin/goldmark/v2/renderer/html"
+)
+
+func BenchmarkGoldmarkV2(b *testing.B) {
+	p := parser.New()
+	r := html.New(html.WithXHTML(), html.WithUnsafe())
+	doBenchmark(b, func(source []byte) ([]byte, error) {
+		var out bytes.Buffer
+		err := r.Render(&out, source, p.Parse(source))
+		return out.Bytes(), err
+	})
+}
+
+func doBenchmark(b *testing.B, render func(src []byte) ([]byte, error)) {
+	b.StopTimer()
+	source, err := os.ReadFile("../../go/_data.md")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		out, err := render(source)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if len(out) < 100 {
+			b.Fatal("No result")
+		}
+	}
+}
diff --git a/_benchmark/comparison/v2/go.mod b/_benchmark/comparison/v2/go.mod
new file mode 100644
index 0000000..1d36532
--- /dev/null
+++ b/_benchmark/comparison/v2/go.mod
@@ -0,0 +1,5 @@
+module benchmark-comparison-v2
+
+go 1.27
+
+require github.com/yuin/goldmark/v2 v2.0.0
diff --git a/_benchmark/comparison/v2/go.sum b/_benchmark/comparison/v2/go.sum
new file mode 100644
index 0000000..9ab8b98
--- /dev/null
+++ b/_benchmark/comparison/v2/go.sum
@@ -0,0 +1,2 @@
+github.com/yuin/goldmark/v2 v2.0.0 h1:P6JP1Px30eqo339He8dDFE8D0BSM21eQcbozLWH+E6g=
+github.com/yuin/goldmark/v2 v2.0.0/go.mod h1:G6M4/qOFtfn01/o14BU1UR2Lo5N3S9Qo7xCuz/sHjGQ=