Hello. I've been using Haml for a while now. Our whole team loves
it, but it is very slow. And yes, this impacts overall app
performance, I have railsbench numbers that back me up, at least for
our particular use cases. Anyway, I've taken various approaches to
make it perform better. One thing I noticed and exploited is that the
HamlEngine evals its precompiled templates every single time, instead
of eval'ing once to create a render method like ActionView does.
I uploaded a patch that implements the ActiveView style "create a
method" approach as:
precompiled_methods_patch.diff
No idea how to link to that in a posting, I am new to Google groups.
The main flaw in this patch is that it does not look at compile times
to see if it should recompile a function for a touched file. This is
because I am working on a Rails project, not very concerned with using
Haml outside of Rails. So for my particular case I put logic in
template.rb to trigger a recompile which you don't see in this
abstracted out version. It needs to go somewhere else (I think?) for
the more general Haml-as-non-Rails-plugin case.
To demonstrate the impact this approach has, here is some output from
"rake benchmark":
Original:
---------------------------------------------------
Benchmark: Haml vs. ERb
---------------------------------------------------
user system total real
haml: 0.200000 0.010000 0.210000 ( 0.201928)
erb: 0.050000 0.000000 0.050000 ( 0.057552)
Haml/ERB: 3.50861
With method pre-eval:
---------------------------------------------------
Benchmark: Haml vs. ERb
---------------------------------------------------
user system total real
haml: 0.120000 0.000000 0.120000 ( 0.121438)
erb: 0.060000 0.000000 0.060000 ( 0.056232)
Haml/ERB: 2.15959
Thanks very much for Haml, it makes my views so pretty!
Hope this is useful,
Tom
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