add 100ms usleep to reduce request frequency

switchepp.php

@@ -1013,7 +1013,7 @@ function switchepp_AdminDomainsTabFields($params)
 
 function switchepp_Sync($params)
 {
-
+    usleep(100000);
     try {
         $client = switchepp_clientloginepp($params);      #Epp Connection
         $login = switchepp_loggedinepp($client, $params);      #Epp Client login