Are rdflib's remote queries ridiculously slow, or is it my code?

I was playing along with this post, and ended up with running code that I had to halt at 7 minutes due to impatience. I jotted down a Groovy script using Jena to mimic the behavior, and got all the results back in a second or two. Is rdflib known to be slow when it queries over a wire, or is my code using a big inefficiency?

Python 2.7 + rdflib 3.0:

from rdflib import Graph, Namespace, RDF

store = Graph()
store.parse("http://source.data.gov.uk/data/education/bis-research-explorer/2010-03-04/education.data.gov.uk.nt", format="nt")

store.bind("PROJECT", "http://research.data.gov.uk/def/project/")
store.bind("FOAF", "http://xmlns.com/foaf/0.1/")

PROJECT = Namespace("http://research.data.gov.uk/def/project/")
FOAF = Namespace("http://xmlns.com/foaf/0.1/")

for organization in store.subjects(RDF.type, FOAF["Organization"]):
    for postcode in store.objects(organization, PROJECT["location"]):
        try:
            print postcode
            store.parse(postcode)
        except:
            print '404 not found'

Groovy 1.7.5 + Jena 2.6.4:

import com.hp.hpl.jena.rdf.model.*

String url= 'http://source.data.gov.uk/data/education/bis-research-explorer/2010-03-04/education.data.gov.uk.nt'
Model model= ModelFactory.createDefaultModel().read(url, 'N-TRIPLE')

Property rdfType= model.getProperty('http://www.w3.org/1999/02/22-rdf-syntax-ns#', 'type')
Property projectLocation= model.getProperty('http://research.data.gov.uk/def/project/', 'location')
Resource foafOrg= model.getResource('http://xmlns.com/foaf/0.1/Organization')

model.listResourcesWithProperty(rdfType, foafOrg).each { org ->
    model.listObjectsOfProperty(org, projectLocation).each { loc ->
        try {
            println loc
        }
        catch (Exception e) {
            println '404 not found'
        }
    }
}