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+Performance analysis for V8-0 branch
+------------------------------------
+
+  Dec 29, 2005: new test and use of -vm in Stalmarck
+
+  Dec 27, 2005: contrib Karatsuba added (~ 30s)
+
+Dec 28, 2005: size decrease
+  mainly due to Defined moved to Qed in FSets (reduction from 95M to 7Mo)
+
+Dec 1-14, 2005: benchmarking server down
+  between the two dates: Godel: -10%, CoRN: -10%
+  probably due to changes around vm (new informative Cast,
+  change of equality in named_context_val) 
+
+  Oct 6, 2005: contribs IPC and Tait added (~ 22s and ~ 25s)
+
+Aug 19, 2005: time decrease after application of "Array.length x=0" Xavier's 
+  suggestions for optimisation
+  (e.g. Nijmegen/QArith: -3%, Nijmegen/CoRN: -7%, Godel: -3%)
+ 
+  Aug 1, 2005: contrib Kildall added (~ 65s)
+
+Jul 26-Aug 2, 2005: bench down
+
+Jul 14-15, 2005: 4 contribs failed including CoRN
+
+Jul 14, 2005: time increase after activation of "closure optimisation"
+  (e.g. Nijmegen/QArith: +8%, Nijmegen/CoRN: +3%, Godel: +13%)
+
+  Jul 7, 2005: adding contrib Fermat4
+
+  Jun 17, 2005: contrib Goodstein extended and moved to CantorOrdinals (~ 30s)
+
+  May 19, 2005: contrib Goodstein and prfx (~ 9s) added 
+
+Apr 21, 2005: strange time decrease
+  (could it be due to the change of Back and Reset mechanism) 
+  (e.g. Nijmegen/CoRN: -2%, Nijmegen/QARITH: -4%, Godel: -11%)
+
+Mar 20, 2005: fixed Logic.with_check bug
+  global time decrease (e.g. Nijmegen/CoRN: -3%, Nijmegen/QARITH: -1.5%)
+
+Jan 31-Feb 8, 2005: small instability
+  (e.g. CoRN: ~2015s -> ~1999s -> ~2032s, Godel: ~340s -> ~370s)
+
+  Jan 13, 2005: contrib SumOfTwoSquare added (~ 38s)