getPublishedSources launchpadlib query times out

[Impact]
Larger queries consistently give 503 errors.

[Test Case]

#!/usr/bin/python
from launchpadlib.launchpad import Launchpad

SRC_PPA_OWNER = 'ubuntu-cloud-archive'
SRC_PPA_NAME = 'havana-staging'

lp = Launchpad.login_with('sync-test', 'production')
src_ppa = lp.people[SRC_PPA_OWNER].getPPAByName(name=SRC_PPA_NAME)
ubuntu = lp.distributions['ubuntu']

source_packages = src_ppa.getPublishedSources(status='Published')

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: python-launchpadlib 1.10.2+ds-2
ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
Uname: Linux 3.13.0-18-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
Date: Thu Mar 20 13:58:46 2014
InstallationDate: Installed on 2014-03-17 (3 days ago)
InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140313)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: python-launchpadlib
UpgradeStatus: No upgrade log present (probably fresh install)