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C++ code compiles very slowly using Eigen in Arduino IDE

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The following setup is compiling very slowly relative to just using a standard C matrix (i.e. double M[35][35]). Some parts of the code have been left out for simplicity. Also, sorry for poor formatting on the comma-initialization of M, didn't copy-paste as planned.

What's the solution for speeding this up? I tried making M a fixed, rather than dynamic, matrix, but this still runs at a pitifully slow pace.

Here is the code:

#include <Eigen.h>
using namespace Eigen;

void get_matrices(){

  Matrix<float,35,35> M;

  M << 173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ,
                         173  ,169  ,164  ,160  ,155  ,150  ,146  ,141  ,137  ,132  ,127  ,123  ,118  ,114  ,109  ,104  ,99.9 ,95.3 ,89.7 ,84.1 ,78.5 ,72.9 ,67.3 ,61.7 ,56.1 ,50.5 ,44.8 ,39.2 ,33.6 ,28   ,22.4 ,16.8 ,11.2 ,5.61 ,0    ;

}

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