diff --git a/src/fast_ping.c b/src/fast_ping.c
index 8e187ad..5e7c810 100644
--- a/src/fast_ping.c
+++ b/src/fast_ping.c
@@ -1762,6 +1762,8 @@ static void *_fast_ping_work(void *arg)
 	int sleep_time = 0;
 	unsigned long expect_time = 0;
 
+	setpriority(PRIO_PROCESS, 0, -5);
+
 	sleep_time = sleep;
 	now = get_tick_count() - sleep;
 	last = now;
diff --git a/src/smartdns.c b/src/smartdns.c
index de2c6c8..f9a056b 100644
--- a/src/smartdns.c
+++ b/src/smartdns.c
@@ -40,6 +40,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/prctl.h>
+#include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <ucontext.h>
@@ -512,10 +513,21 @@ static int _smartdns_create_logdir(void)
 	return 0;
 }
 
+static int _set_rlimit(void)
+{
+	struct rlimit value;
+	value.rlim_cur = 40;
+	value.rlim_max = 40;
+	setrlimit(RLIMIT_NICE, &value);
+	return 0;
+}
+
 static int _smartdns_init_pre(void)
 {
 	_smartdns_create_logdir();
 
+	_set_rlimit();
+
 	return 0;
 }