Hello there,

I don't know Nmap::Parser, but first you want to find out what is taking so long (parsing the XML, going over the network, etc). For that, you could always read the official documentation about it, but this link seems to be a nice introductory article for that.

Also, make sure to take a look at Markup in the Monastery, it will help you making your posts easier to read (and hopefully getting more help for it!).