--- a/hgext3rd/evolve/stablerange.py	Sun Dec 10 04:48:15 2017 +0100
+++ b/hgext3rd/evolve/stablerange.py	Sun Dec 10 04:57:19 2017 +0100
@@ -382,6 +382,17 @@
         stable_parent_range = (stable_parent, rangeid[1])
         return stable_parent_depth, stable_parent_range
 
+    def _warmcachefor(self, repo, rangeid, slicepoint):
+        """warm cache with all the element necessary"""
+        stack = []
+        depth, current = self._parentrange(repo, rangeid)
+        while current not in self._subrangescache and slicepoint < depth:
+            stack.append(current)
+            depth, current = self._parentrange(repo, current)
+        while stack:
+            current = stack.pop()
+            self.subranges(repo, current)
+
     def _subranges(self, repo, rangeid):
         headrev, initial_index = rangeid
         # size 1 range can't be sliced
@@ -390,12 +401,14 @@
         # find were we need to slice
         slicepoint = self._slicepoint(repo, rangeid)
 
-        # top range is always the same, so we can build it early for all
-        top_range = (headrev, slicepoint)
+        self._warmcachefor(repo, rangeid, slicepoint)
 
         stable_parent_data = self._parentrange(repo, rangeid)
         stable_parent_depth, stable_parent_range = stable_parent_data
 
+        # top range is always the same, so we can build it early for all
+        top_range = (headrev, slicepoint)
+
         # now find out about the lower range, if we are lucky there is only
         # one, otherwise we need to issue multiple one to cover every revision
         # on the lower set. (and cover them only once).