Bob N. wrote:
> I just updated a project from 0.10.4 to 0.11-b1.
Everything works
> fine, but *all* of the 0.11 page loads seem quite a bit
slower now.
> Pages take at least 2-3 times as long to load, with is
quite annoying.
> Other than the Trac upgrade, all other server
components (apache) and
> configurations have remained the same.
>
> Is this a known issue, or is there a way I can diagnose
the problem?
>
While a lot of the Trac internals have changed and some of
those changes
are potentially more time-consuming (like the fine-grained
permission
checks), I think the performance hit you observe here is
probably due to
the switch of the template engine.
The power and flexibility of the new template engine
(Genshi, pure
Python) comes at a price: it's significantly slower than
Clearsilver,
which is a text template engine written in C. In addition,
Clearsilver
doesn't take care about the structure of the content, as
opposed to
Genshi which requires well-formed input, guarantees
well-formed output
and allows for all sorts of post-processing of the output
(the classical
text-based template engine vs. xml-based template engine
trade-off).
Working with Clearsilver has proved to be excessively
painful and its
speed was really its only advantage. By using Genshi, we
have a much
simpler installation phase, easier to maintain and customize
templates,
more expressiveness and we enable the plugins to transform
the output by
adding or removing arbitrary elements.
Future releases of Genshi will hopefully continue to make
progress in
performance (see [1]).
For example, there's already a cspeedup extension used for
serialization
that will improve the overall performance of about 10%. If
you want to
use it however, you need Genshi trunk [2] (i.e. the
development version
of the upcoming 0.5 release).
-- Christian
[1] - htt
p://genshi.edgewall.org/wiki/GenshiPerformance
[2] - http://genshi.edgewall.org/wiki/Download#Lat
estDevelopmentSourceCode
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