diff --git a/matrix.py b/matrix.py
index 87450f8..b63e5d0 100644
--- a/matrix.py
+++ b/matrix.py
@@ -544,9 +544,11 @@ class Matrix64Display(SampleBase):
 
             if current_time - self.last_update >= 60:
                 self.update_data()
-                self.update_brightness()
                 self.update_hdd_temps()
                 self.last_update = current_time
+
+            if current_time - self.last_update >= 15:
+                self.update_brightness()
             
             if self.auto_cycle and (current_time - self.last_view_change >= self.view_cycle_interval):
                 self.current_view = (self.current_view + 1) % NUM_VIEWS