diff --git a/hub/kojihub.py b/hub/kojihub.py
index 36489de..ac21585 100644
--- a/hub/kojihub.py
+++ b/hub/kojihub.py
@@ -56,6 +56,17 @@ def log_error(msg):
     logging.getLogger('koji.hub').error(msg)
 
 
+class DirCache(dict):
+    """Cache directory listings for speed over nfs"""
+    def __getitem__(self, key):
+        key = os.path.abspath(key)
+        if key not in self.keys():
+            try:
+                self[key] = os.listdir(key)
+            except OSError:
+                self[key] = []
+        return dict.__getitem__(self, key)
+
 class Task(object):
     """A task for the build hosts"""
 
@@ -1750,6 +1761,8 @@ def repo_init(tag, with_src=False, with_debuginfo=False, event=None):
     builds = dict([[build['build_id'],build] for build in builds])
     #index the packages by arch
     packages = {}
+    # Cache directory listings for speed over nfs
+    dir_cache = DirCache()
     for repoarch in repo_arches:
         packages.setdefault(repoarch, [])
     for rpminfo in rpms:
@@ -1768,7 +1781,8 @@ def repo_init(tag, with_src=False, with_debuginfo=False, event=None):
             continue
         build = builds[rpminfo['build_id']]
         rpminfo['path'] = "%s/%s" % (koji.pathinfo.build(build), koji.pathinfo.rpm(rpminfo))
-        if not os.path.exists(rpminfo['path']):
+        basedir = os.path.dirname(rpminfo['path'])
+        if not os.path.basename(rpminfo['path']) not in dir_cache[basedir]:
             logger.warn("Error: no such file: %(path)s" % rpminfo)
             continue
         packages.setdefault(repoarch,[]).append(rpminfo)