Quickest way to traverse an XML document with Node.js?

From a similar question I found out about XPath and it looks incredibly fast, but I can't use it with Node.js:

> var xp = new XPathEvaluator();
ReferenceError: XPathEvaluator is not defined
    at repl:1:14
    at REPLServer.self.eval (repl.js:110:21)
    at repl.js:249:20
    at REPLServer.self.eval (repl.js:122:7)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)

Can I somehow install it as a module? Or is there an alternative? The problem is that I'm downloading several RSS feeds with total of about 900 entries. I'm downloading them for less than a second, but iterating over each element with jQuery

$(xml).find('entry').each(function() {  });

... takes 10-15 seconds, which for a web service isn't acceptable. Any suggestions?