var zlib = require('zlib');
var buffer = new Buffer('eJzT0yMAAGTvBe8=', 'base64');
function nullfun(){};

function test() {
    console.log(process.memoryUsage());
    for (var i = 0; i < 100; i++) {
        zlib.unzip(buffer, nullfun);
    };
    process.nextTick(test);
};
process.nextTick(test);

....
{ rss: 870871040, heapTotal: 42841856, heapUsed: 8936624 }
{ rss: 871223296, heapTotal: 42841856, heapUsed: 9354648 }
{ rss: 871858176, heapTotal: 42841856, heapUsed: 9630272 }
{ rss: 872452096, heapTotal: 42841856, heapUsed: 10048328 }
{ rss: 872853504, heapTotal: 42841856, heapUsed: 10331552 }
Убито
vflash@vu:~/work$