diff --git a/usr/bin/unzip_bruteforce b/usr/bin/unzip_bruteforce
index 23f96fe..050c09c 100755
--- a/usr/bin/unzip_bruteforce
+++ b/usr/bin/unzip_bruteforce
@@ -7,16 +7,21 @@ fi
 
 LIST=$1
 FILE=$2
-LIST=$1
-FILE=$2
+COUNT=$(mktemp)
+echo 0 > "$COUNT"
+export FILE COUNT
+
+xargs -a "$LIST" -P4 -I{} bash -c '
+    line="$1"
+
+    # atomic-ish counter
+    n=$(($(<"$COUNT")+1))
+    echo "$n" > "$COUNT"
+
+    ((n % 1000 == 0)) && echo "$n tries..."
 
-while IFS= read -r line; do
-    #echo "try: $line"
     if unzip -P "$line" -t "$FILE" >/dev/null 2>&1; then
         echo "FOUND: $line"
-        break
+        killall xargs 2>/dev/null
     fi
-done < "$LIST"
-
-exit 0
-
+' _ {}