If you don't have deprecation warnings I would suspect some change in 0.4 
has introduced type instabilities. If you are using typed concatenations 
you could be hit by https://github.com/JuliaLang/julia/issues/13254.

Den torsdag 22 oktober 2015 kl. 23:03:00 UTC+2 skrev Kris De Meyer:
>
> Are there any general style guidelines for moving code from 0.3.11 to 
> 0.4.0? Running the unit and functionality tests for a module that I 
> developed under 0.3.11 in 0.4, I experience a 500 times slowdown of blocks 
> of code that I time with @time. 
>
> Can't even imagine where I have to start looking, and find it 
> flabbergasting that perfectly valid julia code under 0.3.11 (not generating 
> a single warning) can show such a performance degradation under 0.4.0.
>
> Anyone seen anything similar? Is there some fundamental difference in how 
> code is JIT-compiled under 0.4.0?
>
> Thanks,
>
> Kris
>
>
>
>

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