[Twisted-web] Re: [Nevow] template performance

Michael Hudson mwh at python.net
Fri Dec 15 06:21:05 CST 2006

Manlio Perillo <manlio_perillo at libero.it> writes:

> First let me say that I really like Nevow template system.
> Once you became expert with it, it proves to be really flexible.
> The problem is the performance.
> I have done a simple test with the rendering of a table 5 * 20, Nevow
> against Django, and Nevow is much slower.
> The problem is that, I think, there are a lot of objects adaptation.

How confident are you about that?  When I was last playing this game,
it seemed to be copying lots and lots of stuff that was the main
source of the slowdown, and I got a factor of 2 speedup by dint of a


> Is it possible to use that same model used by django.template?
> You pass a context (that is a dictionary usable like a stack:
> push/pop) to the render function.
> All the data directive will search the data in the context (like
> djando, first dictionary lookup, then attribute lookup, and so).
> As an example n:data='x.y' ==> ctx['x']['y'].
> A rend.Page.renderHTTP can build a context from the instance dictionary.

I'm not sure I understand.  You can implement IResource.renderHTTP
however you like, I guess...


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