diff --git a/Makefile b/Makefile
index 6ccc317..a80d1f9 100644
--- a/Makefile
+++ b/Makefile
@@ -47,8 +47,36 @@ RUN_LOCAL := bash scripts/with-local-server.sh
 artillery-local:
 	@echo "Load-testing $(EXAMPLE) on :8080..."
 	@$(RUN_LOCAL) $(EXAMPLE) 8080 \
-		env TEST_ENVIRONMENT=local npx artillery run --target http://localhost:8080 \
-			--config $(TEST_KIT)/configs/load-test.yml $(TEST_KIT)/scenarios/core/load-test.yml
+		npx artillery run --target http://localhost:8080 \
+			--config $(TEST_KIT)/configs/load-test.yml \
+			-o artillery-report-$(basename $(notdir $(EXAMPLE))).json \
+			$(TEST_KIT)/scenarios/core/load-test.yml
+
+# Opt-in A/B load comparison of two framework examples, diffed by the kit's
+# perf-compare over Artillery's own `-o` reports (test-kit >= 0.4.0). Manual
+# only — deliberately NOT in `all`/`functional-tests`: two full load runs are
+# ~2 GB of S3 egress.
+#   make perf-compare BASELINE=examples/express-basic.ts CANDIDATE=examples/hono-basic.ts
+BASELINE  ?= examples/express-basic.ts
+CANDIDATE ?= examples/hono-basic.ts
+
+.PHONY: perf-compare
+perf-compare:
+	@echo "Baseline:  $(BASELINE) on :8080"
+	@$(RUN_LOCAL) $(BASELINE) 8080 \
+		npx artillery run --target http://localhost:8080 \
+			--config $(TEST_KIT)/configs/load-test.yml \
+			-o artillery-report-baseline.json \
+			$(TEST_KIT)/scenarios/core/load-test.yml
+	@echo "Candidate: $(CANDIDATE) on :8081"
+	@$(RUN_LOCAL) $(CANDIDATE) 8081 \
+		npx artillery run --target http://localhost:8081 \
+			--config $(TEST_KIT)/configs/load-test.yml \
+			-o artillery-report-candidate.json \
+			$(TEST_KIT)/scenarios/core/load-test.yml
+	@npx s3-website-perf-compare compare \
+		--baseline  artillery-report-baseline.json  --baseline-label  $(basename $(notdir $(BASELINE))) \
+		--candidate artillery-report-candidate.json --candidate-label $(basename $(notdir $(CANDIDATE)))
 
 # Conformance gate: assert the HTTP contract (status, content-type,
 # content-length) with the test kit's `expect`-enabled config. Unlike the load
diff --git a/docs/performance.md b/docs/performance.md
index a6997ae..f6d61fa 100644
--- a/docs/performance.md
+++ b/docs/performance.md
@@ -175,10 +175,17 @@ Run the kit against a `tsx` example server on your local `src/` (no build, no
 Docker image):
 
 ```bash
-make artillery-local        # load test
+make artillery-local        # load test (writes artillery-report-<example>.json)
 make conformance-local      # HTTP-contract gate
 ```
 
+A/B load comparison between two framework examples (opt-in; two load runs are
+~2 GB of S3 egress, so it is not part of `make all`):
+
+```bash
+make perf-compare BASELINE=examples/express-basic.ts CANDIDATE=examples/hono-basic.ts
+```
+
 ### Container image testing
 
 The published container image is built and load/conformance-tested in
diff --git a/package-lock.json b/package-lock.json
index 4955b04..a69f4e2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
       "devDependencies": {
         "@aws-sdk/client-s3": "^3.832.0",
         "@biomejs/biome": "^2.0.4",
-        "@forkzero/s3-website-test-kit": "^0.2.1",
+        "@forkzero/s3-website-test-kit": "^0.4.0",
         "@hono/node-server": "^2.0.0",
         "@types/debug": "^4.1.12",
         "@types/express": "^5.0.3",
@@ -2021,9 +2021,9 @@
       }
     },
     "node_modules/@forkzero/s3-website-test-kit": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/@forkzero/s3-website-test-kit/-/s3-website-test-kit-0.2.1.tgz",
-      "integrity": "sha512-/VDfJoomJxDX0FAJbNt0CzoYt1WNc536p2Ia4m0wC4b0i+BpH+2AujYdVSZMpT14+R12VnCmR23KckReg135CA==",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@forkzero/s3-website-test-kit/-/s3-website-test-kit-0.4.0.tgz",
+      "integrity": "sha512-UziHuWnDFfniSl7+TFz6XxLG78TEma39kT3KLhs6BnOx47LC6Vy+O5HvrOkhvf9aRtFMkpqaNKRE6kkjNE5ulg==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
diff --git a/package.json b/package.json
index e49fdb3..181cac1 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "devDependencies": {
     "@aws-sdk/client-s3": "^3.832.0",
     "@biomejs/biome": "^2.0.4",
-    "@forkzero/s3-website-test-kit": "^0.2.1",
+    "@forkzero/s3-website-test-kit": "^0.4.0",
     "@hono/node-server": "^2.0.0",
     "@types/debug": "^4.1.12",
     "@types/express": "^5.0.3",