node.js - Socket.io loading very slow -

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first time run web server main page loading 25 s , remove line:

<script src="/socket.io/socket.io.js" type="text/javascript"> </script> page working fine. why socket.io slow ?

var app = express()   , server = require('http').createserver(app)   , io = require('socket.io').listen(server);  io.enable('browser client minification');  // send minified client io.enable('browser client etag');          // apply etag caching logic based on version number io.set('log level', 1);                    // reduce logging io.set('transports', [     'websocket'   , 'flashsocket'   , 'htmlfile'   , 'xhr-polling'   , 'jsonp-polling' ]);


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