diff --git a/sf-buffer/src/sf_replay.cpp b/sf-buffer/src/sf_replay.cpp
index f10ea62..aa249c7 100644
--- a/sf-buffer/src/sf_replay.cpp
+++ b/sf-buffer/src/sf_replay.cpp
@@ -113,7 +113,7 @@ int main (int argc, char *argv[]) {
                 BufferUtils::FILE_MOD * 512 * 1024 * 2,
                 0);
 
-        this_thread::sleep_for(chrono::milliseconds(5));
+        this_thread::sleep_for(chrono::milliseconds(1000));
     }
 
     zmq_close(socket);
diff --git a/sf-writer/sf_h5_writer.cpp b/sf-writer/sf_h5_writer.cpp
index 1889f6d..2c14af9 100644
--- a/sf-writer/sf_h5_writer.cpp
+++ b/sf-writer/sf_h5_writer.cpp
@@ -30,7 +30,7 @@ int main (int argc, char *argv[])
     size_t n_modules = 32;
 
     auto ctx = zmq_ctx_new();
-    zmq_ctx_set (ctx, ZMQ_IO_THREADS, 4);
+    zmq_ctx_set (ctx, ZMQ_IO_THREADS, 16);
 
     auto socket = zmq_socket(ctx, ZMQ_PULL);