diff --git a/core/scanner.py b/core/scanner.py
index 8b2c9e5..22b6477 100644
--- a/core/scanner.py
+++ b/core/scanner.py
@@ -12,10 +12,10 @@ def _ping_one(ip, is_win):
     try:
         if is_win:
             r = subprocess.run(
-                ["ping", "-n", "1", "-w", "300", str(ip)],
+                ["ping", "-n", "1", "-w", "500", str(ip)],
                 stdout=subprocess.DEVNULL,
                 stderr=subprocess.DEVNULL,
-                timeout=2,
+                timeout=3,
                 creationflags=_NO_WINDOW
             )
         elif sys.platform == "darwin":
@@ -59,7 +59,7 @@ def _ping_sweep(network, progress_cb=None):
             progress_cb(done_count[0], total)
         return (str(ip), ok)
 
-    with ThreadPoolExecutor(max_workers=len(hosts)) as executor:
+    with ThreadPoolExecutor(max_workers=min(64, len(hosts))) as executor:
         futures = [executor.submit(_ping_and_track, ip) for ip in hosts]
         for f in as_completed(futures):
             ip_str, ok = f.result()