Re: Diazo overhead?

On 5 November 2014 19:36, Sean Upton <[email protected]> wrote:

> Diazo newbie question:
>
> What's the typical overhead for Diazo to run a transform on a very
> typical page in Plone?  I have not been able to determine this, and
> have not yet needed to invest the effort to profile it against some
> non-trivial theme.
>

Pretty low. It's pretty well optimised (unless you have very complex or
very open-ended XPath queries).

Probably much less than whatever else you're doing on the page. But you
always need to benchmark your particular use case and try not to optimise
prematurely.


> In trying to understand how plone.app.theming (and
> plone.transformchain) works, AFIACT it looks like there is no
> caching/memoization of a transform result, even if the response body
> prior to transform is byte-for-byte identical to a previously
> transformed request in the same instance (not in development mode;
> only the transforms themselves are cached, not the result).
>

No, because there's not been a need to optimise that bit yet. Generally, if
this were the case, you'd cache the page anyway and/or pass a 304 response
so the request would never even hit Plone.

Martin

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