diff --git a/config.json b/config.json
index cd8f8fa..a0c36a7 100644
--- a/config.json
+++ b/config.json
@@ -3,5 +3,6 @@
   "brightness": 200,
   "gpio": 18,
   "type": "grb",
-  "fade_ticks": 25
+  "fade_ticks": 25,
+  "sleep_time": 100
 }
\ No newline at end of file
diff --git a/lights.js b/lights.js
index 1465b54..c610ccf 100644
--- a/lights.js
+++ b/lights.js
@@ -54,7 +54,7 @@ export function tick() {
     tick_pattern();
   }
   ws281x.render(pixels);
-  ws281x.sleep(500);
+  ws281x.sleep(cfg.sleep_time || 500);
 }
 
 function fade(index) {