diff --git a/bin/weewx/restx.py b/bin/weewx/restx.py
index 88261d87..dfd16da8 100644
--- a/bin/weewx/restx.py
+++ b/bin/weewx/restx.py
@@ -569,10 +569,12 @@ class StdWunderground(StdRESTful):
 
     def new_loop_packet(self, event):
         """Puts new LOOP packets in the loop queue"""
-        syslog.syslog(syslog.LOG_DEBUG, "restx: raw packet: %s" % event.packet)
+        if weewx.debug >= 3:
+            syslog.syslog(syslog.LOG_DEBUG, "restx: raw packet: %s" % event.packet)
         self.cached_values.update(event.packet, event.packet['dateTime'])
-        syslog.syslog(syslog.LOG_DEBUG, "restx: cached packet: %s" %
-                      self.cached_values.get_packet(event.packet['dateTime']))
+        if weewx.debug >= 3:
+            syslog.syslog(syslog.LOG_DEBUG, "restx: cached packet: %s" %
+                          self.cached_values.get_packet(event.packet['dateTime']))
         self.loop_queue.put(
             self.cached_values.get_packet(event.packet['dateTime']))
 
diff --git a/docs/changes.txt b/docs/changes.txt
index f4bdd456..d0bbd1e3 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -5,6 +5,8 @@ weewx change history
 
 Fixed log syntax in wmr100 and wmr9x8 drivers.
 
+Emit rapidfire cache info only when debug is level 3 or higher.
+
 3.7.0 03/11/2017
 
 The tag $current now uses the record included in the event NEW_ARCHIVE_RECORD,