diff --git a/Dockerfile b/Dockerfile
index f25b16e..dc73438 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,9 +35,11 @@ ENV UPLOAD_PATH=/app/data/files
 
 EXPOSE 5000
 
-# gthread worker class so SSE long-poll connections don't starve regular requests.
-# 2 workers x 16 threads = 32 concurrent slots; each SSE client just holds one thread.
+# Single worker with many threads. The SSE broadcaster lives in process
+# memory - mit mehreren Workern wuerden Events den Empfaenger nicht
+# erreichen wenn Sender und Empfaenger auf verschiedenen Workern haengen.
+# 32 Threads = bis zu 32 gleichzeitige Requests/SSE-Streams.
 CMD ["gunicorn", "--bind", "0.0.0.0:5000", \
-     "--worker-class", "gthread", "--workers", "2", "--threads", "16", \
+     "--worker-class", "gthread", "--workers", "1", "--threads", "32", \
      "--timeout", "120", "--keep-alive", "65", \
      "wsgi:application"]