Because I think it is pointless for various reasons:

1) I am biased and people outside the community would not trust it
2) Code changes so it would become obsolete quick
3) One can produce benchmarks to produce almost any result one wants
4) People who are concerned about 2x factors in speed are not web2py 
audience. The point of web2py is security and speed of development. For 
example we can make web2py more than 2x faster moving sessions management 
to the app level (like Flask) and not creating the request.env object. Yet 
we do not do it. What matters is not speed but scalability and web2py 
scales no better or worse than any other major Python framework.
5) Every time I published any comparison between web2py and other 
frameworks in the past, somebody got upset and attacked us. Not worth it.

On Thursday, 11 July 2013 20:44:07 UTC-5, viniciusban wrote:
>
> Massimo, how about you writing an article about this subject and share 
> with us? 
>
> So, this could be spread. 
>
> On Thu, Jul 11, 2013 at 2:12 PM, Massimo Di Pierro 
> <massimo....@gmail.com <javascript:>> wrote: 
> > I agree. I will do. 
> > 
> > On Thursday, 11 July 2013 11:51:39 UTC-5, Arnon Marcus wrote: 
> >> 
> >> I see. 
> >> In that case, I think it would be advisable to note that in 
> presentations, 
> >> as peope might get the wrong impression... 
> >> 
> >> On Thursday, July 11, 2013, Massimo Di Pierro <massimo....@gmail.com> 
> >> wrote: 
> >> > It is true but not an issue. Django is faster only in hello world 
> >> > examples because does not perform as many header 
> validation/conversions as 
> >> > web2py does and because you cannot turn off sessions in web2py. As 
> soon as 
> >> > one uses templates, web2py is faster. If you use databases the speed 
> is 
> >> > about the same because that becomes the bottle neck. 
> >> > Massimo 
> >> > 
> >> > On Monday, 8 July 2013 17:08:53 UTC-5, Arnon Marcus wrote: 
> >> >> 
> >> >> BTW, is it really true that web2py is twice as slower than django 
> >> >> nowadays? 
> >> >> How can that be? 
> >> >> Didn't it used to be twice as fast? 
> >> >> When I first evaluated it 3 years ago, it was by-far the fastest - 
> what 
> >> >> changed? 
> >> >> You said that one of the core principles of accepting changes to 
> >> >> web2py, is that they should always make it run faster - never 
> slower. Has 
> >> >> that principle been broken? 
> >> >> And what about the whole ORM-vs-DAL fiasco? Didn't you guys always 
> say 
> >> >> that a DAL is always faster than an ORM? Given that it makes sense, 
> how come 
> >> >> Django is faster? Shouldn't it's ORM make it slower? 
> >> >> And as for executing-vs-importing - didn't you say before that it 
> >> >> should be a non-issue in terms of performance? What changed? 
> >> > 
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