Socket.io memory doesn't drop of after clients disconnect

var server = require('socket.io').listen(1781);
server.set('log level', 1);

setInterval(function() {
    console.log(process.memoryUsage());
}, 60000);

I have memory leaks in my Socket.io 0.9.16 and Node 0.10.12 / 0.10.13 application. After connecting some clients the RSS memory increases but after I disconnect them the memory doesn't drop off. I stripped my app down to the upper code to exclude any of my mistakes. After connecting 1000 clients, the process takes 65MB (initially it took ~15MB) and after I disconnect all clients, the memory stays high. Any help?

All of the articles/answers i read were about earlier versions of node or socket.io. I am desperate to find a solution on this.