add warning for heavy load usage
add warning for heavy load usage

ebraminio/commafeed,wesley1001/commafeed,Athou/commafeed,RavenB/commafeed,wesley1001/commafeed,RavenB/commafeed,Athou/commafeed,zhangzuoqiang/commafeed,ahmadassaf/CommaFeed-RSS-Reader,Athou/commafeed,Hubcapp/commafeed,wesley1001/commafeed,Hubcapp/commafeed,wesley1001/commafeed,syshk/commafeed,syshk/commafeed,ahmadassaf/CommaFeed-RSS-Reader,Athou/commafeed,ebraminio/commafeed,ebraminio/commafeed,syshk/commafeed,Hubcapp/commafeed,zhangzuoqiang/commafeed,ahmadassaf/CommaFeed-RSS-Reader,ebraminio/commafeed,RavenB/commafeed,Hubcapp/commafeed,ahmadassaf/CommaFeed-RSS-Reader,syshk/commafeed,zhangzuoqiang/commafeed,RavenB/commafeed,zhangzuoqiang/commafeed