--- a/hgext3rd/evolve/depthcache.py	Wed Nov 22 15:05:15 2017 +0100
+++ b/hgext3rd/evolve/depthcache.py	Thu Nov 23 16:53:29 2017 +0100
@@ -129,9 +129,18 @@
         """compute the rev of one revision, assert previous revision has an hot cache
         """
         cl = repo.unfiltered().changelog
-        for rev in data:
+        total = len(data)
+
+        def progress(pos, rev):
+            repo.ui.progress('updating depth cache',
+                             pos, 'rev %s' % rev, unit='revision', total=total)
+        progress(0, '')
+        for idx, rev in enumerate(data, 1):
             assert rev == len(self._data), (rev, len(self._data))
             self._data.append(self._depth(cl, rev))
+            if not (idx % 10000): # progress as a too high performance impact
+                progress(idx, rev)
+        progress(None, '')
 
     def _depth(self, changelog, rev):
         cl = changelog