there was a discussion of the slowdown due to multi-threading.
http://article.gmane.org/gmane.comp.nlp.moses.user/5193/match=multi+threading+boost+lib+compile+error+threaded+moses
i found it to be about 10% slower for hierarchical model. It may be 
slower for phrase-based since that has more locking. I think it's an 
inevitable trade-off between speed and having threading.

i don't thinking anyone's mentioned it since then.

On 05/08/2012 11:27, Marcin Junczys-Dowmunt wrote:
> Hi,
> has anyone noticed that Moses seems to be about 20-30% slower than about
> a year ago? I happen to have a checkout from last September lying
> around. With the same settings, and the same data the translation of
> 1000 sentences takes around 925 seconds now, but 690 seconds with the
> September version. Translation results are the same.
>
> I use the same binary phrase table with around 200 million phrase pairs,
> no lexical reordering, the same 3-gram KenLm language model, but
> compiled to the corresponding format which changed between versions. The
> data is fully cached in the operational system read cache, so it seems
> this are processing issues.
>
> Has anyone else noticed something like that?
> Best,
> Marcin
> _______________________________________________
> Moses-support mailing list
> [email protected]
> http://mailman.mit.edu/mailman/listinfo/moses-support
> .
>

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