Hi!
Can anybody explain why the speed of numerical integration of some expressions in Matematicas 6 and 9 is so different. For instance, expression
Table[Timing[Do[NIntegrate[(1 - v^2)/(1 + Sqrt[1 - v^2])^2, {v, 0, 1}], {1000}]][[1]], {i,10}] // {Mean[#], StandardDeviation[#]} &
on the same computer in v.6 is evaluated to
{0.9813, 0.0203199}
and in v.9, to
{2.666057, 0.01551}
That is M9 is 2.5 times slower than M6. Why?
