--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -65,2 +65,3 @@
 #include "libpq/pqformat.h"
+#include "libpq/pqsignal.h"
 #include "miscadmin.h"
@@ -2731,2 +2732,5 @@ XLogSendPhysical(void)
 	enlargeStringInfo(&output_message, nbytes);
+	PG_SETMASK(&BlockSig);
+	pg_usleep(65 * 1000 * 1000);
+	PG_SETMASK(&UnBlockSig);
 	XLogRead(&output_message.data[output_message.len], startptr, nbytes);