Re: [eigen] Eigen 3 is extremely slow

[Robert Lupton the Good <rhl@xxxxxxxxxxxxxxxxxxx>]

>> Any suggestions on what might be going wrong, or should I stick with blitz++
>> ?
> 
> Do you compile with optimization? Without optimization Eigen can get really slow due to its heavy template machinery.

Older versions of g++ (e.g. 4.1.2) don't handle the heavy templating well either, even optimised.  4.2 is OK

				R