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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: Benchmarking Gnus
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Jesper Harder <harder@ifa.au.dk> writes:

> larsi@gnus.org (Lars Magne Ingebrigtsen) writes:
>
>> There are now three things that take about the same time when 
>> entering a group, and account for 95% of the time spent:
>>
>> 1) parsing NOV headers (this has gotten slower due to MIME 
>>    stuff, I'm guessing) 2) scoring 3) creating and outputting 
>>    the threads
>>
>> If someone wants to look closer at this, then I'm all for it. 
   :-)
>
> Here's a small tweak, which speeds up threading a bit (around 
> 5-10%): `gnus-parent-id' is usually called without the optional 
> argument -- in that case we only want the last msg.id in 
> References, so we don't really need to call 
> `gnus-split-references' to parse *all* the references and build 
> a list of them.

I committed it, thanks.