gcc optimization

Hi,

I have noticed that the run times for MCMCglmm models (mainly written in 
C/C++) have suddenly jumped up on Linux machines (Ubuntu/Linaro 4.6.4 
and  Scientific Linux 6.6) yet they have remained stable on Windows 
where they run much faster than on Linux. I wondered whether something 
had changed with the deafult optimization flags for gcc? I am using R 3.2.3.

Cheers,

Jarrod

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