diff --git a/tests/phase3/.gitignore b/tests/phase3/.gitignore
new file mode 100644
index 00000000..89f9ac04
--- /dev/null
+++ b/tests/phase3/.gitignore
@@ -0,0 +1 @@
+out/
diff --git a/tests/phase3/compare_phase3_results.sh b/tests/phase3/compare_phase3_results.sh
new file mode 100644
index 00000000..7c3945ca
--- /dev/null
+++ b/tests/phase3/compare_phase3_results.sh
@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -ne 2 ]]; then
+  echo "Usage: $0 <baseline_csv> <candidate_csv>"
+  exit 1
+fi
+
+BASELINE_CSV="$1"
+CANDIDATE_CSV="$2"
+
+if [[ ! -f "$BASELINE_CSV" ]]; then
+  echo "Baseline CSV not found: $BASELINE_CSV"
+  exit 1
+fi
+if [[ ! -f "$CANDIDATE_CSV" ]]; then
+  echo "Candidate CSV not found: $CANDIDATE_CSV"
+  exit 1
+fi
+
+calc_stats() {
+  local csv="$1"
+  local metric="$2"
+  awk -F, -v metric="$metric" '
+    NR>1 && $2==metric {print $4}
+  ' "$csv" | sort -n | awk '
+    {
+      vals[n++] = $1;
+      sum += $1;
+    }
+    END {
+      if (n == 0) {
+        print "NA,NA,0";
+        exit;
+      }
+      mean = sum / n;
+      mid = int((n - 1) / 2);
+      if (n % 2 == 1) {
+        median = vals[mid];
+      } else {
+        median = (vals[mid] + vals[mid + 1]) / 2.0;
+      }
+      p95i = int((n - 1) * 0.95 + 0.5);
+      if (p95i >= n) p95i = n - 1;
+      p95 = vals[p95i];
+      printf "%.3f,%.3f,%d\n", median, p95, n;
+    }
+  '
+}
+
+printf "metric,baseline_median_ms,candidate_median_ms,median_delta_pct,baseline_p95_ms,candidate_p95_ms,p95_delta_pct,samples\n"
+
+for metric in \
+  irelative_strict_fail_case \
+  irelative_best_effort_case \
+  irelative_execute_resolver_case
+  do
+  b_stats="$(calc_stats "$BASELINE_CSV" "$metric")"
+  c_stats="$(calc_stats "$CANDIDATE_CSV" "$metric")"
+
+  b_med="$(echo "$b_stats" | cut -d, -f1)"
+  b_p95="$(echo "$b_stats" | cut -d, -f2)"
+  b_n="$(echo "$b_stats" | cut -d, -f3)"
+
+  c_med="$(echo "$c_stats" | cut -d, -f1)"
+  c_p95="$(echo "$c_stats" | cut -d, -f2)"
+  c_n="$(echo "$c_stats" | cut -d, -f3)"
+
+  if [[ "$b_med" == "NA" || "$c_med" == "NA" ]]; then
+    printf "%s,%s,%s,%s,%s,%s,%s,%s\n" "$metric" "$b_med" "$c_med" "NA" "$b_p95" "$c_p95" "NA" "0"
+    continue
+  fi
+
+  delta_med="$(awk -v b="$b_med" -v c="$c_med" 'BEGIN { if (b==0) { print "NA" } else { printf "%.3f", ((c-b)/b)*100.0 } }')"
+  delta_p95="$(awk -v b="$b_p95" -v c="$c_p95" 'BEGIN { if (b==0) { print "NA" } else { printf "%.3f", ((c-b)/b)*100.0 } }')"
+
+  samples="$b_n"
+  if [[ "$c_n" -lt "$b_n" ]]; then
+    samples="$c_n"
+  fi
+
+  printf "%s,%.3f,%.3f,%s,%.3f,%.3f,%s,%s\n" "$metric" "$b_med" "$c_med" "$delta_med" "$b_p95" "$c_p95" "$delta_p95" "$samples"
+done
diff --git a/tests/phase3/run_phase3_measurements.sh b/tests/phase3/run_phase3_measurements.sh
new file mode 100755
index 00000000..33f12b04
--- /dev/null
+++ b/tests/phase3/run_phase3_measurements.sh
@@ -0,0 +1,125 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+BUILD_DIR="${ROOT_DIR}/build_phase3"
+UNIT_DIR="${ROOT_DIR}/tests/build_unittests"
+OUT_DIR="${ROOT_DIR}/tests/phase3/out"
+SCENARIO="${1:-candidate}"
+RUNS="${2:-10}"
+
+mkdir -p "${OUT_DIR}"
+mkdir -p "${BUILD_DIR}"
+
+TS="$(date +%Y%m%d_%H%M%S)"
+CSV_FILE="${OUT_DIR}/phase3_${SCENARIO}_${TS}.csv"
+TXT_FILE="${OUT_DIR}/phase3_${SCENARIO}_${TS}.txt"
+
+log() {
+  printf '[phase3] %s\n' "$*"
+}
+
+warn() {
+  printf '[phase3][warn] %s\n' "$*"
+}
+
+run_ms() {
+  local start_ns end_ns elapsed_ns
+  start_ns="$(date +%s%N)"
+  if ! "$@" >/dev/null; then
+    return 1
+  fi
+  end_ns="$(date +%s%N)"
+  elapsed_ns=$((end_ns - start_ns))
+  printf '%s' "$((elapsed_ns / 1000000))"
+}
+
+run_elf_case_ms() {
+  local spec="$1"
+  run_ms bash -lc "cd \"${UNIT_DIR}\" && ./elf \"${spec}\""
+}
+
+append_row() {
+  local metric="$1"
+  local iteration="$2"
+  local value="$3"
+  local notes="$4"
+  printf '%s,%s,%s,%s,%s\n' "${SCENARIO}" "${metric}" "${iteration}" "${value}" "${notes}" >> "${CSV_FILE}"
+}
+
+log "Collecting environment metadata"
+{
+  echo "scenario=${SCENARIO}"
+  echo "timestamp=${TS}"
+  echo "hostname=$(hostname)"
+  echo "kernel=$(uname -r)"
+  echo "cpu_model=$(awk -F: '/model name/ {print $2; exit}' /proc/cpuinfo | sed 's/^ //')"
+  echo "git_head=$(git -C "${ROOT_DIR}" rev-parse HEAD)"
+  echo "git_branch=$(git -C "${ROOT_DIR}" rev-parse --abbrev-ref HEAD)"
+} > "${TXT_FILE}"
+
+log "Building project binaries"
+cmake -S "${ROOT_DIR}" -B "${BUILD_DIR}" -DCMAKE_BUILD_TYPE=Release >/dev/null
+cmake --build "${BUILD_DIR}" -j4 >/dev/null
+
+BENCH_GUEST="${ROOT_DIR}/guest/guest.elf"
+CAN_RUN_BENCH=0
+
+log "Attempting to build guest benchmark binary"
+if (
+  cd "${ROOT_DIR}/guest" &&
+  bash ./build.sh >/dev/null
+); then
+  if [[ -f "${BENCH_GUEST}" ]]; then
+    CAN_RUN_BENCH=1
+  else
+    warn "guest build succeeded but ${BENCH_GUEST} is missing; lifecycle bench will be skipped"
+  fi
+else
+  warn "guest build failed in this environment; lifecycle bench will be skipped"
+fi
+
+log "Building unit tests"
+(
+  cd "${ROOT_DIR}/tests"
+  bash ./run_unit_tests.sh -R "test_basic|test_elf" >/dev/null
+)
+
+printf 'scenario,metric,iteration,value_ms,notes\n' > "${CSV_FILE}"
+
+log "Measuring relocation mode runtime lanes (${RUNS} runs each)"
+for i in $(seq 1 "${RUNS}"); do
+  ms="$(run_elf_case_ms "[Initialize],IRELATIVE strict-fail mode rejects dynamic Rust ELF")"
+  append_row "irelative_strict_fail_case" "${i}" "${ms}" "unit test lane"
+
+done
+for i in $(seq 1 "${RUNS}"); do
+  ms="$(run_elf_case_ms "[Initialize],Verify dynamic Rust ELF relocation support")"
+  append_row "irelative_best_effort_case" "${i}" "${ms}" "unit test lane"
+
+done
+for i in $(seq 1 "${RUNS}"); do
+  ms="$(run_elf_case_ms "[Initialize],IRELATIVE execute-resolver mode runs dynamic Rust ELF")"
+  append_row "irelative_execute_resolver_case" "${i}" "${ms}" "unit test lane"
+
+done
+
+if [[ "${CAN_RUN_BENCH}" -eq 1 ]]; then
+  log "Measuring lifecycle microbench lines from bench executable"
+  BENCH_OUT="${OUT_DIR}/bench_${SCENARIO}_${TS}.log"
+  if "${BUILD_DIR}/bench" "${BENCH_GUEST}" > "${BENCH_OUT}" 2>&1; then
+    grep -E "VM fork:|vmcall:|timed_vmcall:|VM vmexit time:|Fast reset:|Fast vmcall:" "${BENCH_OUT}" >> "${TXT_FILE}" || true
+    echo "bench_status=ok" >> "${TXT_FILE}"
+  else
+    warn "bench executable failed at runtime; lifecycle bench metrics will be marked unavailable"
+    echo "bench_status=failed" >> "${TXT_FILE}"
+  fi
+else
+  BENCH_OUT="(skipped)"
+  echo "bench_status=skipped" >> "${TXT_FILE}"
+fi
+
+log "Outputs"
+log "CSV: ${CSV_FILE}"
+log "Report: ${TXT_FILE}"
+log "Bench log: ${BENCH_OUT}"