diff --git a/neopig.py b/neopig.py
index ca6f13e..78aa86c 100644
--- a/neopig.py
+++ b/neopig.py
@@ -874,9 +874,9 @@ class NeoPig:
 
         logger.info(f"Backfilling {len(pages)} missing screenshots for {domain}")
 
-        # Concurrent workers: 3x CPU in fast mode, 1 otherwise (for crawl delay)
+        # Concurrent workers: 3x CPU in fast mode, 1x CPU otherwise (crawl delay handled per-capture)
         import multiprocessing
-        max_workers = multiprocessing.cpu_count() * 3 if fast_mode else 1
+        max_workers = multiprocessing.cpu_count() * 3 if fast_mode else multiprocessing.cpu_count()
         semaphore = asyncio.Semaphore(max_workers)
         if fast_mode and max_workers > 1:
             logger.info(f"Fast mode: {max_workers} concurrent workers")