diff --git a/src/include/utils.h b/src/include/utils.h
index 84685e1..9145fa5 100644
--- a/src/include/utils.h
+++ b/src/include/utils.h
@@ -3,12 +3,14 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <sys/time.h>
 
 #define LENGTH(X) (sizeof(X) / sizeof(X)[0])
 
 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
 
+double get_time();
 void die(const char *format, ...);
 void *ecalloc(size_t number_of_member, size_t member_size);
 
diff --git a/src/main.c b/src/main.c
index ef64bc2..7be9439 100644
--- a/src/main.c
+++ b/src/main.c
@@ -197,8 +197,11 @@ void set_wallpaper_by_index(uint32_t index) {
     wallpaper_config, monitors, index, screen_size->width, screen_size->height);
 
   if (wallpaper) {
+    double start = get_time();
     set_wallpaper(wallpaper);
+    double end = get_time();
     free(wallpaper);
+    printf("set wallpaper cost: %fs\n", end - start);
   }
 
   free(screen_size);
diff --git a/src/utils.c b/src/utils.c
index 812a7c0..0327859 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -7,6 +7,12 @@
 #include <string.h>
 #include <unistd.h>
 
+double get_time() {
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  return tv.tv_sec + tv.tv_usec / 1000000.0;
+}
+
 void die(const char *fmt, ...) {
   va_list ap;
   va_start(ap, fmt);