diff --git a/scripts/compare.sh b/scripts/compare.sh
index 0d58370..7bbaee9 100755
--- a/scripts/compare.sh
+++ b/scripts/compare.sh
@@ -71,8 +71,8 @@ echo "Benchmark regression check"
 echo "=========================="
 echo ""
 
-# Relative checks (ferrflow benchmarks only)
-for key in $(jq -r '.benchmarks | keys[]' "$LATEST" | grep '\-ferrflow-'); do
+# Relative checks (ferrflow binary under test only)
+for key in $(jq -r '.benchmarks | keys[]' "$LATEST" | grep -- '-ferrflow-binary-'); do
   new_median=$(jq -r ".benchmarks[\"$key\"].median_ms" "$LATEST")
   old_median=$(jq -r ".benchmarks[\"$key\"].median_ms // empty" "$BASELINE" 2>/dev/null || echo "")
 
diff --git a/scripts/run.sh b/scripts/run.sh
index 1d6c9ce..293f052 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -186,22 +186,14 @@ measure_memory() {
   fi
 }
 
-get_npm_binary_size() {
-  local pkg="$1"
-  local tmp_dir bin
-  tmp_dir=$(mktemp -d)
-  (
-    cd "$tmp_dir"
-    npm init -y &>/dev/null
-    npm install --save "$pkg" &>/dev/null 2>&1
-  )
-  bin=$(find "$tmp_dir/node_modules" -type f -path "*/@$pkg/*/bin/$pkg" 2>/dev/null | head -1)
+get_binary_size() {
+  local bin
+  bin=$(command -v "$1" 2>/dev/null || true)
   if [[ -n "$bin" && -f "$bin" ]]; then
-    du -m "$bin" | awk '{printf "%.1f", $1}'
+    stat -L -c %s "$bin" | awk '{printf "%.1f", $1/1048576}'
   else
     echo "N/A"
   fi
-  rm -rf "$tmp_dir"
 }
 
 # Get npm package install size in MB
@@ -306,7 +298,7 @@ for tool in $TOOLS; do
       echo "$npm_size" > "$RAW_DIR/${tool}-npm-size.txt"
     fi
     if [[ "$method" == "binary" && "$tool" == "ferrflow" ]]; then
-      bin_size=$(get_npm_binary_size ferrflow)
+      bin_size=$(get_binary_size "$local_bin")
       echo "$bin_size" > "$RAW_DIR/ferrflow-binary-size.txt"
     fi
 
diff --git a/tests/compare.bats b/tests/compare.bats
index 5b7f70e..5c4692a 100644
--- a/tests/compare.bats
+++ b/tests/compare.bats
@@ -157,3 +157,15 @@ EOF
   [ "$status" -eq 1 ]
   [[ "$output" == *"Usage"* ]]
 }
+
+@test "ignores npm and docker ferrflow regressions" {
+  make_json "$TMPDIR/baseline.json" \
+    '"single-ferrflow-npm-check": {"median_ms": 100.0, "stddev_ms": 1.0, "memory_mb": "N/A"}, "single-ferrflow-docker-check": {"median_ms": 100.0, "stddev_ms": 1.0, "memory_mb": "N/A"}'
+  make_json "$TMPDIR/latest.json" \
+    '"single-ferrflow-npm-check": {"median_ms": 300.0, "stddev_ms": 1.0, "memory_mb": "N/A"}, "single-ferrflow-docker-check": {"median_ms": 300.0, "stddev_ms": 1.0, "memory_mb": "N/A"}'
+
+  run bash "$SCRIPT_DIR/compare.sh" "$TMPDIR/baseline.json" "$TMPDIR/latest.json"
+  [ "$status" -eq 0 ]
+  [[ "$output" != *"single-ferrflow-npm-check"* ]]
+  [[ "$output" == *"All benchmarks within thresholds"* ]]
+}