diff --git a/r2/r2/lib/rising.py b/r2/r2/lib/rising.py
index 3eaf07364..9eadd7a75 100644
--- a/r2/r2/lib/rising.py
+++ b/r2/r2/lib/rising.py
@@ -20,14 +20,16 @@
 # Inc. All Rights Reserved.
 ###############################################################################
 
-from pylons import g, c
-from r2.models.link import Link, Subreddit
-from r2.lib import utils
-from r2.lib import count
-
 from datetime import datetime
 
-cache = g.cache
+from pylons import g
+
+from r2.lib import count
+from r2.models.link import Link
+
+
+CACHE_KEY = "rising"
+
 
 def calc_rising():
     sr_count = count.get_link_counts()
@@ -38,7 +40,7 @@ def calc_rising():
     counts = link_count.values()
     counts.sort(reverse=True)
     maxcount = sum(counts[:10]) / 20
-    
+
     #prune the list
     rising = [(n, link_names[n].sr_id)
               for n in link_names.keys() if link_count[n] < maxcount]
@@ -57,15 +59,11 @@ def calc_rising():
     rising.sort(lambda x, y: r(score(y) - score(x)))
     return rising
 
+
 def set_rising():
-    rising = calc_rising()
-    cache.set('rising', rising)
+    g.cache.set(CACHE_KEY, calc_rising())
+
 
 def get_rising(sr):
-    #get the sr_ids
-    sr_ids = sr.rising_srs()
-    if sr_ids:
-        rising = cache.get('rising', [])
-        return [p[0] for p in filter(lambda pair: pair[1] in sr_ids, rising)]
-    else:
-        return []
+    rising = g.cache.get(CACHE_KEY)
+    return [link for link, sr_id in rising if sr.keep_for_rising(sr_id)]
diff --git a/r2/r2/lib/utils/_utils.pyx b/r2/r2/lib/utils/_utils.pyx
index e00296dfd..b8686f9db 100644
--- a/r2/r2/lib/utils/_utils.pyx
+++ b/r2/r2/lib/utils/_utils.pyx
@@ -136,7 +136,7 @@ cdef dict timeintervald = dict(second = 1,
                                week   = 60 * 60 * 24 * 7,
                                month  = 60 * 60 * 24 * 30,
                                year   = 60 * 60 * 24 * 365)
-cdef timeinterval_fromstr(str interval):
+cpdef timeinterval_fromstr(str interval):
     "Used by timeago and timefromnow to generate timedeltas from friendly text"
     parts = interval.strip().split(' ')
     if len(parts) == 1:
diff --git a/r2/r2/models/subreddit.py b/r2/r2/models/subreddit.py
index 31f4fa8df..066e491ba 100644
--- a/r2/r2/models/subreddit.py
+++ b/r2/r2/models/subreddit.py
@@ -471,15 +471,9 @@ class Subreddit(Thing, Printable):
 
         return subreddits if return_dict else subreddits.values()
 
-    #rising uses this to know which subreddits to include, doesn't
-    #work for all/friends atm
-    def rising_srs(self):
-        if c.default_sr or not hasattr(self, '_id'):
-            user = c.user if c.user_is_loggedin else None
-            sr_ids = self.user_subreddits(user)
-        else:
-            sr_ids = (self._id,)
-        return sr_ids
+    def keep_for_rising(self, sr_id):
+        """Return whether or not to keep a thing in rising for this SR."""
+        return sr_id == self._id
 
     def get_links(self, sort, time):
         from r2.lib.db import queries
@@ -840,6 +834,9 @@ class FakeSubreddit(Subreddit):
         self.title = ''
         self.link_flair_position = 'right'
 
+    def keep_for_rising(self, sr_id):
+        return False
+
     @property
     def _should_wiki(self):
         return False
@@ -965,6 +962,9 @@ class AllSR(FakeSubreddit):
     name = 'all'
     title = 'all subreddits'
 
+    def keep_for_rising(self, sr_id):
+        return True
+
     def get_links(self, sort, time):
         from r2.models import Link
         from r2.lib.db import queries
@@ -988,9 +988,6 @@ class AllSR(FakeSubreddit):
         from r2.lib.db import queries
         return queries.get_all_gilded_comments()
 
-    def rising_srs(self):
-        return None
-
 
 class AllMinus(AllSR):
     name = _("%s (filtered)") % "all"
@@ -1000,6 +997,9 @@ class AllMinus(AllSR):
         self.srs = srs
         self.sr_ids = [sr._id for sr in srs]
 
+    def keep_for_rising(self, sr_id):
+        return sr_id not in self.sr_ids
+
     @property
     def title(self):
         return 'all subreddits except ' + ', '.join(sr.name for sr in self.srs)
@@ -1024,6 +1024,15 @@ class _DefaultSR(FakeSubreddit):
     path = '/'
     header = g.default_header_url
 
+    def _get_sr_ids(self):
+        if not hasattr(self, "_cached_sr_ids"):
+            user = c.user if c.user_is_loggedin else None
+            self._cached_sr_ids = Subreddit.user_subreddits(user)
+        return self._cached_sr_ids
+
+    def keep_for_rising(self, sr_id):
+        return sr_id in self._get_sr_ids()
+
     def is_moderator(self, user):
         return False
 
@@ -1048,8 +1057,7 @@ class _DefaultSR(FakeSubreddit):
             return q
 
     def get_links(self, sort, time):
-        user = c.user if c.user_is_loggedin else None
-        sr_ids = Subreddit.user_subreddits(user)
+        sr_ids = self._get_sr_ids()
         return self.get_links_sr_ids(sr_ids, sort, time)
 
     @property
@@ -1142,6 +1150,9 @@ class MultiReddit(_DefaultSR):
         self.banned_sr_ids = [sr._id for sr in srs if sr._spam]
         self.kept_sr_ids = [sr._id for sr in srs if not sr._spam]
 
+    def keep_for_rising(self, sr_id):
+        return sr_id in self.kept_sr_ids
+
     def is_moderator(self, user):
         if not user:
             return False
@@ -1163,9 +1174,6 @@ class MultiReddit(_DefaultSR):
     def get_links(self, sort, time):
         return self.get_links_sr_ids(self.kept_sr_ids, sort, time)
 
-    def rising_srs(self):
-        return self.kept_sr_ids
-
     def get_all_comments(self):
         from r2.lib.db.queries import get_sr_comments, merge_results
         srs = Subreddit._byID(self.kept_sr_ids, return_dict=False)