--- a/contrib/perf.py	Wed Jan 12 13:54:39 2011 -0600
+++ b/contrib/perf.py	Sat Jan 15 12:28:10 2011 +0100
@@ -81,7 +81,6 @@
 
 def perfindex(ui, repo):
     import mercurial.revlog
-    mercurial.revlog._prereadsize = 2**24 # disable old lazy parser
     n = repo["tip"].node()
     def d():
         repo.invalidate()