diff -r be92ddc636e3 -r 77d56a5e74a5 contrib/perf.py
--- a/contrib/perf.py	Thu Mar 15 15:59:26 2012 -0500
+++ b/contrib/perf.py	Fri Mar 16 19:58:47 2012 -0500
@@ -83,7 +83,7 @@
     n = repo[rev].node()
     def d():
         c = repo.changelog.read(n)
-        repo.changelog._cache = None
+        #repo.changelog._cache = None
     timer(d)
 
 def perfindex(ui, repo):