This is my second day using Julia and I'm getting increasingly excited!

However, I nearly didn't make it even this far, as my early test programs had awful performance, and I nearly gave up with the common statement "beautiful language but the performance sucks". This was after carefully reading the documentation, especially the performance tips section.

Luckily, I happened across this discussion:
https://groups.google.com/d/topic/julia-dev/_UZ2A_Jp8Jc/discussion
and after changing one line of code from using A.^3, where A is a large two dimensional array, to using a nested for loop, I got performance faster than my C++ code (with an almost fair comparison).

I am merely suggesting here that a sentence is added to the performance tips section to note that currently, explicit loops can be much faster than array operations. Such a note would have saved me time, and prevented me from almost abandoning julia.

Thanks for making a truly beautiful (and fast) language,
John