Deal.II 8.5.1 seems to be 20% slower than 8.0.0. This is the timing I get 
when running the Step-23 tutorial (output to screen and vtk is suppressed):

deal.II version 8.0.0:

$ time ./step-23 
Number of active cells: 16384
Number of degrees of freedom: 16641

real    0m3.432s
user    0m6.320s
sys    0m0.612s

deal.II version 8.5.1:

$ time ./step-23 
Number of active cells: 16384
Number of degrees of freedom: 16641

real    0m4.430s
user    0m7.080s
sys    0m0.492s

In general, I get about 20% slow down for my own code when upgrading from 
8.0.0 to 8.5.1. What is the reason of such a slow down? Does the deal.II 
follow the right direction given new versions become gradually slower?!

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